Mercedes-Benz SL-Class vs Audi TT

What's the difference?

The new Mercedes-AMG SL63 4Matic+ is guaranteed to turn heads for decades to come. But there’s enormous design and engineering substance underpinning this car’s undoubted good looks. Stunning performance, superb dynamics and top-shelf safety make this a powerhouse GT to be reckoned with.

Note: CarsGuide attended this event as a guest of the manufacturer, with accommodation and meals provided.

Audi is finally saying hooroo to this model which has made the world stop and stare like I did on that Parisian street all those years ago.

The Final Edition is a fitting tribute to this iconic sports car and I’m glad Audi didn’t go ‘OTT’ and deck it out with gimmicky features. 

At the same time the Final Edition’s big rear wing, blacked out badges, wheels and interior colour coding hint that this is not just any ordinary TT and those that know will know.

Farewell Audi TT, we hope something just like you but probably electric appears to stop us in our tracks again. 

Rather than a strict two-seater, this time around the SL adds the flexibility of ‘+2’ rear seating while the previous 'Vario’ folding hardtop has been binned, the new car returning to a traditional, electrically-folding and weight-saving (-21kg) soft top. 

Mercedes-Benz design chief Gorden Wagener started the new model’s development from a ‘clean sheet’ and Mercedes-AMG says “not a single component comes from the predecessor SL, or any other model such as the AMG GT Roadsters”. 

Always a subjective call, but I think this car’s proportions are just about perfect. The lengthy bonnet with its twin longitudinal ‘Power Domes’, raked windscreen and fat haunches create a wide stance and presence that’s almost impossible to ignore.

Aggression, as with the sinister headlights and 21-inch rims, is subtly combined with soft curves along the flanks and around the rear. Note the seamless door handles.

And it’s not all about aesthetics. Active aero has been integrated into the front apron and retractable rear spoiler. Plus the ‘Z-fold’ roof design does away with the need for a separate cover.

The interior is sub-zero cool with slick screens, an 11.9-inch display covering multimedia and a 12.3-inch unit for instrumentation ahead of the driver, being particular highlights.

Turbine-style air-vents at the leading edge of the split-level dash and alloy trim elements are a tip-of-the-hat to SLs past and the deft mix of large flat surfaces with complex curves oozes design confidence.

The Audi TT’s shape has morphed over the past 25 years from the cute, rounded bubble car that first appeared in the late 1990s to the more aggressively and sleek looking sports car with the sharp creases we see today.

Still, there are the familiar pumped-out wheel arches and, while not as prominent as it used to be, that arching roof and the way it flows down to those tail-lights and stumpy tail remains so true to the original TT.

The TT Final Edition has a more menacing and athletic look than the regular 45 TFSI its based on thanks to the S Line Competition Plus exterior package.

So you’re getting the big fixed wing, an aggressive front bumper, and the 19-inch alloy wheels in gloss black.

There’s a black package, too, which add the decals down the side, the blacked-out badges, the black exhaust tips and black wing mirrors.

My test car’s paint colour was Turbo Blue and you can see in the images of the cabin how Audi matches interior elements in the same colour. The contrast stitching on the seats also lifts the sporty feel into high-end territory.

It’s a simple cabin, though, free from busy buttons and giant screens and the incorporation of climate controls into the air vents is genius. 

If you’re wondering what the TT Final Edition’s dimensions are its 4191mm long, 1832mm wide and 1376mm tall. 

In the context of a high-performance GT, practicality is pretty impressive.

At just over 4.7m long the SL is a sizeable machine and much of its lengthy (2700mm) wheelbase is devoted to making the driver and front passenger comfortable.

There’s plenty of space for that pairing and just enough storage to cope with the ‘things’ they’ll typically bring with them.

Door pockets offer enough room for a few odds and ends, although you’ll struggle with even a medium-size bottle unless you’re willing to lay it down horizontally along the top of the aperture.

A handy lidded bin between the front seats doubles as a centre armrest, there are two cupholders under a sliding lid in the centre console and the glove box is a decent size. 

Power and connectivity options run to four USB-C ports, a 12-volt socket and the wireless device charging pad.

Then there are the rear ‘+2’ seats, and Mercedes makes no bones about the fact they’re intended for occasional use only, even suggesting a 1.5m occupant height limit.

And there’s no doubt they offer a handy emergency seat or a fun kids’ zone. Just ask a Porsche 911 Carrera owner how much this kind of seating arrangement increases a sports car’s flexibility.

At 183cm I gave the back seat a crack, which meant sliding the front (passenger) seat way forward with the backrest close to upright. But I squeezed in, and there was just enough legroom for a person in front at the same time. 

With the roof in place there’s the added pleasure of cranking your head over to around 45 degrees. But it’s do-able! 

No storage, adjustable ventilation, or power back there. But that’s fair enough, especially given there are USBs available in the front centre storage box.

Boot volume is 240 litres with the roof up and 213 litres with it folded, which is enough for some light luggage, and not too shabby when you think a Toyota Corolla hatch offers up just 217 litres (with all seats up).

There’s a 12V socket in there, but don’t bother looking for a spare, in the event of a flat your only option is a repair/inflator kit.

The Audi TT isn’t going to cut it as a family car, but it’s more practical than a lot of people might think.

First this is a '2+2' sports car meaning those two rear seats are there for the odd occasion when you might need them, because the space back there is limited.

But for most of the time having a place to throw a jacket or extra luggage and not have to ask your co-plot to rest it on their lap will feel like absolute luxury.

Up front head and legroom is good, even for me at 189cm tall. Being a coupe the doors are long and although the car is low I found getting in and out easy.

There’s a pretty clever use of space when it comes down to cabin storage. You’ll find door pockets, a glove box, a covered centre console box and a hidey hole/wireless phone charger in the dash.

Back seat passengers have built-in shelves near their armrests. Surprisingly there are four cupholders - two of which fold out of the dash.   

The boot isn’t huge at 305 litres but you can fold the rear seats down to open up the cargo capacity to 712 litres.

So, compared to its two-seater sports car rivals, the TT is relatively and pleasantly practical.

Audi has taken the $84,000 TT Coupe 45 TFSI quattro and created this TT Final Edition with extra features for a list price of $88,749. 

Here’s what you’re getting. First there’s the 'S Line Competition Plus' exterior package which beefs up the TT’s looks with the big, fixed rear wing and 19-inch Audi Sport wheels in gloss 'Anthracite Black' with red brake calipers.

There’s also the black exterior package which brings the black Audi rings badging, black chunky exhaust tips, black side trims and Audi logo decals.  

Inside there’s Nappa leather S sport seats; an Alcantara and leather flat-bottomed steering wheel with paddle shifters; while the armrests, door handles and the centre console are covered by the 'Leather Package' which includes contrasting stitching.  

Metallic paint is also included as part of the Final Edition’s features. Ours was 'Turbo Blue'.

Much of the rest of the Final Edition’s features are shared with the TT Coupe 45 TFSI quattro and includes a 12.4-inch 'Virtual Cockpit' digital instrument display, sat nav, CD and DVD player, eight-speaker stereo, digital radio, Apple CarPlay and Android Auto, wireless phone charging and proximity unlocking.

Our car had a couple of options fitted - the privacy glass which is $950 and the 20-inch gloss black alloy wheels for $1600. 

Rivals to the TT include BMW’s Z4 which lists for $99,200, and its Toyota GR Supra twin for $87,380, while the Nissan Z Coupe is also part of that sporty coupe club at $75,800.

You might already know this but the TT doesn’t have a central media screen and that can appear odd in a new car world where big screens dominate the dashboard. 

This new ‘4Matic’ all-wheel-drive SL63 features AMG’s (M177) 4.0-litre twin-turbo V8, superseding the previous rear-wheel-drive SL’s similarly configured 5.5-litre unit.

Hand built by one AMG technician from start to finish, it produces 430kW (around 580hp) from 5500-6500rpm and 800Nm across a broad plateau from 2500-5000rpm.

It’s something of a mechanical masterpiece, and the previous seven-speed auto transmission, driving the rear wheels only, has been replaced by a nine-speed dual-clutch auto (with wet multi-disc start-off clutch) sending drive to all four wheels via Merc’s ‘4Matic’ AWD system.

The TT Final Edition has the same 2.0-litre, four-cylinder, turbo-petrol engine as the regular 45 TFSI TT Coupe with the same 180kW and 370Nm outputs.

The TT is light, though, at only 1460kg and that grunt is enough to slingshot it from 0-100km/h in 5.1 seconds.

The transmission is an eight-speed dual-clutch automatic which sends drive to all four wheels.

Sure, the TTS has more grunt and the TTRS is nothing short of wonderful with its five cylinder powerplant, but the 2.0-litre engine in the Final Edition feels perfectly suited to what is a fun and engaging sports car.

Mercedes-AMG’s official fuel economy number for the SL63 on the combined (WLTP) cycle is 13.9L/100km, the 4.0-litre twin-turbo V8 emitting 319g/km of CO2 in the process.

On the roughly 300km launch program we covered urban, B-road and some freeway running, returning an (indicated) average of 17.5L/100km. And that reflects some enthusiastic driving along the way.

The fuel tank requires 70 litres of 98 RON premium unleaded to fill it which translates to a theoretical range of around 500km, dropping to 400km using our real-world number.

Audi says that after a combination of open and urban roads the TT Final Edition should use 7.0L/100km.

My own testing took in a combination of the best country roads and worst city traffic and at the fuel pump I measured 10.9L/100km.

But most of my time was spent in 'Dynamic' drive mode with the fuel-saving idle stop system switched off. 

The TT's 55-litre fuel tank means you should have a range of about 785km.

I recall driving the AMG SL65 around the backroads of Tassie a few years ago and that twin-turbo V12 monster famously packed 1000Nm of torque, while this car ‘only’ has 800.

But there comes a point where enough is enough… and this is enough!

With maximum torque available from 2500-5000rpm and peak power (430kW) on call from 5500-6500rpm there’s always stupendous acceleration available with a squeeze of your right foot.

Claimed 0-100km/h time is supercar fast at 3.6 seconds, while top speed is a toupe-troubling 315 km/h. And that’s electronically limited!

A typically ferocious engine noise and howling exhaust note accompany rapid progress and shifts from the nine-speed dual-clutch transmission are quick and positive, not to mention especially enjoyable using the steering wheel-mounted paddles.

There are six ‘AMG Dynamic Select’ drive programs from Comfort through to Race, the latter including a Drift Mode, which we didn’t experiment with. Nor did we dip into the ‘AMG Track Pace’ system for circuit-focused mapping and timing

However, far from drifting, the grippy Michelin Pilot Sport 4S rubber (275/35 fr - 305/30 rr) plants the car securely with the all-wheel-drive system and electronic locking rear diff playing their part.

I found the perfect set-up was in the ‘Individual’ mode with the engine, transmission and steering in racier settings and the suspension in ‘Comfort’. The adaptive damping in this configuration mixes smooth ride compliance with sharp dynamic response.

The car’s aluminium space frame chassis is part of a body structure mixing aluminium, magnesium, fibre composites and various strength steels.

Torsional rigidity is claimed to have been improved by 18 per cent and despite the lack of a roof the SL feels tight and solid.

Suspension is by alloy double wishbones front and rear with adaptive damping and active hydraulic anti-roll stabilisation standard (so, no physical anti-roll bars).

At the same time the 4Matic AWD system is able to vary torque distribution up to 100 per cent to the front or rear axle depending on where drive can be put to best use.

The speed sensitive, variable ratio, electronically controlled steering is accurate and turns in beautifully with good road feel. No doubt assisted by electric rear steering able to adjust the angle of the rear tyres by up to 2.5 degrees.

All this adds up to a hugely impressive package that, despite its 1970kg kerb weight, feels agile, athletic and able to attack corners like an overgrown hot hatch, putting its power down with unwavering authority.   

While indecently fast the SL63 can also stop rapidly with the AMG high-performance braking system standard. 

Huge composite ventilated and cross-drilled discs (390mm fr - 360mm rr) are clamped by six-piston fixed alloy calipers at the front and single-piston units at the rear. They wash off speed calmly and consistently with perfect pedal feel.

Even at highway speeds, particularly with the windows up, normal conversation is easy with the roof down. But if you need to raise (or lower) it, the operation takes 15 seconds and is possible up to 60km/h. 

Under the heading of miscellaneous observations, the turning circle is a not insubstantial 12.8m, so beware in the car park.

A front axle lift function is a welcome standard feature, raising the car’s nose 30mm with the press of a button. And lift locations are stored in GPS data, so the car will subsequently remember to lift itself at the same place, even if you don’t! 

Heating and cooling for the front seats combined with the heated steering wheel and Air Scarf neck warming makes winter top-down driving a pleasure.

The digital instrument display is not only crystal clear, it can be changed through multiple configurations, including a tunnel-like graphic for engine revs as well as specific readouts for speed, g-force, the lot.

At the same time, the central media screen’s angle can be adjusted to better cope with reflections and the windscreen wiper system Merc calls ‘Magic Vision Control’ channels fluid along the wiper arms onto the rubbers, which isn’t new, but works spectacularly well here.  

There are plenty of sports cars out there which are dynamically superb yet uncomfortable to sit in.

But the TT’s cabin is as ergonomic as it is stylish with a great, low sitting position and good pedal feel, a steering wheel that can be adjusted to be just right and still with plenty of space underneath for long legs like mine.

The shifter feels the right distance away, good visibility even out the rear window and plenty of ventilation.  And we haven’t even started driving yet.

The TT Final Edition felt to me how a TT should. Fun. Not overpowered nor brutally firm and not ridiculously loud.

Instead, my drive in the Final Edition, which took me along some of my favourite country roads, was one of the most enjoyable runs I’ve had in any car. 

This is a car which ‘listens’ to you and replies with exactly what you’ve asked for in the way it turns into corners and accelerates out of them, and pulls up when you need it too. 

There’s so much connection to the road, you can hear the sticks and stones flying up into the guards, you can feel the coarse chip bitumen through the steering wheel.

But it’s all so easy, too. The suspension is firm but soft enough that you can drive this daily. The steering is light but still with great feedback. 

Some sports cars leave you feeling exhausted, like you’ve just wrestled a bear but the TT Final Edition just leaves you feeling like you've been on a ride and all you want to do is run back around to line up and get back on it again.

This could be a deal breaker for you. The Final Edition, like all Audi TTs, falls short in terms of safety equipment compared to its rivals.

This third generation TT only managed four ANCAP stars out of a maximum of five when it was assessed in 2015.

This was due to the model not having AEB or lane keeping assistance or rear cross-traffic alert.

The only assistance features it has are blind spot warning and self parking (which is handy). It doesn’t even have adaptive cruise control.

There are two top tether points for child seats in the second row but please be aware that the TT was also scored low by ANCAP for child occupant crash protection.

If you do have children and are looking for something safer but still small and sporty, the BMW 2 Series Gran Coupe or Mercedes-Benz A-Class are excellent choices. 

Something to think about.  

The SL63 4Matic+ will be covered by Mercedes-AMG’s five-year/unlimited km warranty, with roadside and accident assistance included for the duration, both of which are expected in this category. 

Maintenance intervals are 12 months/20,000km, and a fixed-price service plan lists an average of $1583 for each of the first three visits to the workshop. Not exactly small change, but not unheard of in this part of the market.

The TT Final Edition is covered by Audi’s five-year, unlimited kilometre warranty.

Serving is recommended every 12 months or 15,000km and although Audi doesn't have capped price servicing there is a five-year/75,000km plan which will cost about $3000 in total for regular maintenance. Yep, that's $600 per workshop visit.