Porsche 911 vs BMW Alpina B4

What's the difference?

In describing this 911, Porsche talks about the 'T-feeling'. It should be light and agile, delivering fun, driving pleasure, yet still suitable for everyday use.

Sure, the safety could be better and the warranty lags the market, but that stuff fades into the background when the T feeling takes over. What a great car!

You could almost call the B4 S the anti-M4. It's still fast and practical but from a completely different perspective. It's much more a grand tourer than the M4 and even with the Akrapovic exhaust (usually a byword for joyous, anti-social racket), subtle.

For some, the price won't matter because the Alpina delivers what they want - M4-like straight line performance without the histrionics or the uncompromising chassis. And there's also a bit of that perverse exclusivity of the styling that you won't get anywhere else.

One of the most recognisable profiles in the automotive world, the 911 has evolved and grown over time but there's no mistaking it for anything other than Zuffenhausen's finest.

For the record, the current '992' 911 is a whopping 367mm longer, 242mm wider and 30mm lower than the 1963 original. And the majority of models share the same (1852mm) wide-body look, the Turbo and GT3 RS broadening that to 1900mm.

Multiple solid and metallic colours are available at no extra cost, three of which are exclusive to the Carrera T, but if you like our test car's 'striking' 'Python Green' finish, it'll set you back an extra $5700.

Car-spotters on the lookout for the Carrera T will need to tick off 'Agate Grey' accents on the tail-light grille, badging and mirror housings as well as a grey top tint windscreen, specific side graphics and Carrera S wheels in 'Titanium Grey'.

The cabin in our test car also has also been optionally upgraded with the 'Carrera T Interior Package' ($4120), which adds extra leather trim as well as coloured seat belts and contrast stitching.

Our car has also picked up the 'Adaptive Sports Seats' ($5510). Subjective call, of course, but I love the dark cloth seat inserts with tiny flecks of green. It's Porsche retro-cool, but somehow contemporary at the same time. Beautiful.

And the five-dial instrument cluster under a gently curved cowl is a 911 design signature, although the central tachometer is now flanked by twin 7.0-inch, configurable displays.

Ergonomically and aesthetically, this layout is hard to fault.

Alpina has always had a particular aesthetic that could uncharitably be termed as mid-'80s West German - all set square angles and body graphics. Think David Hasselhoff's Berlin Wall look. The company has never really deviated from adding squared-off body bits to the various BMWs it has rebadged under its long-running agreement.

For the B4S, Alpina adds the signature billion-spoke alloy wheels (only a slight exaggeration), a new front splitter complete with Alpina lettering, a weirdly proportioned boot lid lip spoiler and - not even joking - pinstripes. Like I said, mid-'80s West German. You can still recognise the sleek 4 Series Coupe but perhaps the worst of it is the super-sized, wonky-looking ALPINA B4S on the boot.

Inside is rather more restrained apart from the ill-fitting Alpina plaque under the climate control. Again, it's all 4 Series in here, with the lovely Merino leather liberally applied across the cabin. Less lovely is the wood on the door pulls and console but the door cards have an oddly appealing woven leather which looks and feels good.

Sadly the standard 4 Series steering wheel is along for the ride. There's nothing wrong with it - although the Alpina logo does look out of place - but if I were a product planner, I'd beg for the lovelier M wheel.

Even though the current 911 dwarfs the original '901' series of sixty years ago, it's still aimed primarily at accommodating the driver and front passenger, with '+2' rear seating a handy addition for kids, or adults in short trip emergencies.

In other markets, the addition of the rear seats is a no-cost option, whereas here they're the default fitment and removing them is the zero-dollar choice. Which makes sense because they add significantly to the car's usability.

Either way, a sports car of this type is never going to be SUV practical. However, when you look at it in the context of the Carrera T's competitors, this 911 does pretty well.

It feels appropriately snug inside, yet there's more than enough breathing space in the front and a liveable distance between driver and passenger.

For storage there are two slim compartments in each door, with a cavity for bottles, as well as a cupholder in the centre console and another pop-out holder in the dash on the passenger side.

As in most 911s, you can swap the centre console cupholder out with a small oddments tray insert which is a nifty piece of practical thinking.

There's also a modest glove box, a shallow lidded compartment between the seats and clothes hooks on the front seat backrests.

Connectivity and power options run to a pair of USB-C ports in the centre console box and a 12-volt outlet in the passenger footwell. Nothing in the back, which isn't a big surprise.

And the 132-litre boot is the only substantial cargo space, with enough room for several soft bags or a medium suitcase… even a mid-week grocery top-up.

Luggage-type storage inside the car is helped by the rear seat backs folding down to create a level platform.

But bear in mind there's no spare. A can of sealant and air compressor are on board instead.

If you're in the front, you're in luck - it's a comfortable place to be, with plenty of leg and headroom. Down back isn't terrible despite the coupe roofline. The two seats are nicely shaped for maximum comfort and separated by an odd plastic tray. The fold-down armrest has two cupholders.

Front seat passengers score a pair of cupholders (bring the total to four for the car) and the long doors will hold a bottle each.

The boot swallows a reasonable 445 litres, which isn't at all bad.

If you thought BMW don't mess about when pricing up its cars, you best strap yourself in. The 440i-based B4S starts at a solid $149,900. That's $48,000 more than the 440i and significantly more than an M4 Pure. But there's plenty of gear on offer and some genuine, bespoke Alpina additions.

Standard are 20-inch signature Alpina alloys, 16-speaker harmon kardon-branded stereo with DAB, super-soft Merino leather everywhere, dual-zone climate control, around-view cameras, reversing camera, sat nav, keyless entry and start, front and rear parking sensors, active cruise control, heated and electric front seats, head-up display, auto headlights and active LED headlights, LED taillights and electric sunroof.

The stereo and sat nav are run by BMW's iDrive. It's a cracker of a system and almost gets away without Apple CarPlay and Android Auto. The absence of such simple pleasures at this price point is a bit lame, but here we are.

One of the saddest things about recent 911s is the fact that when you open the cover you can't see the engine unless you decide to break out the spanners and remove everything that's hiding it.

If you did, you'd reveal a 3.0-litre, all-alloy, dry-sumped, twin-turbo flat six-cylinder engine which remains unchanged from the entry Carrera model.

Featuring direct-injection and variable valve control, it sends more than 280kW (380hp) and 450Nm (from 1950-5000rpm) to the rear wheels through a seven-speed manual gearbox, or in this case, the no-cost optional eight-speed dual-clutch auto.

Suffice it to say, in a car weighing less than 1.5 tonnes, that's plenty of propulsion, and even though an engine hanging over the rear axle remains a peculiar 911 throwback, the white-coated boffins in Stuttgart continue to make it work brilliantly well.

A lot of your extra money turns up under the bonnet. These days the 440i packs BMW's slick B58 turbo straight six and the B4S does likewise. The boys from Buchloe in Bavaria (there are certain to be women there, too, I just liked the alliteration) added a pair of Alpina-spec turbos to generate a whopping 324kW and, more importantly, 660Nm. Alpina says 600Nm (the max torque figure of the brilliant M4 CS) is available from 2000-5000rpm, while the full 660Nm is available from 3000 to 4500rpm.

The M4 Pure has 317kW and 550Nm from the S55 straight-six. Just so you know.

Like the 440i but unlike the M4, the B4S employs the dependably brilliant eight-speed ZF automatic found throughout the BMW range.

Porsche's official fuel economy number for the combined (ADR 81/02 - urban, extra-urban) cycle is 10.8L/100km for the dual-clutch auto as tested, the 3.0-litre twin-turbo six emitting 246g/km of CO2 in the process.

During a week of city, suburban and some at times enthusiastic highway running, we averaged 15.0L/100km (at the pump), while the car's onboard computer indicated 16.1L/100km, which isn't out of line with the super- and turbo-charged V8s this car competes with.

Minimum fuel requirement is 98 RON 'premium' unleaded and you'll need 64 litres of it to fill the tank.

Using the official number, that translates to a driving range of around 590km, which drops to roughly 430km using our real-world figure.

Alpina quotes 7.9L/100km on the combined cycle and we went through the premium unleaded at the rate of 11.7L/100km. I enjoyed myself, so that's not a terrible result.

At 1470kg the 911 Carrera T is 35kg lighter than the entry-level car it's based on, thanks largely to reduced sound insulation, lightweight glazing and a more compact battery.

Yes, the rear seats are fitted to our test example, which sends the scales back up a bit, but the reduced sound deadening still raises the standard sports exhaust's glorious rumble through the cabin.

Porsche claims 0-100km/h in 4.0 seconds for the auto and 4.5s for the seven-speed manual. Yep, it's quick!

Peak torque (450Nm) is on hand from 1950-5000rpm, which means there's always substantial mid-range punch available, with the dual-clutch auto's eight ratios also helping to keep things on the boil.

I love a manual gearbox as much as the next person, but this dual-clutch is ultra fast yet refined with the wheel-mounted paddles adding to the fun.

The 'Driving Mode' dial on the steering wheel enables selection of 'Normal', 'Sport', 'Sport Plus' and 'Individual' modes, with each selection displayed in the instrument cluster.

And given the 'Sport Chrono Package' is standard the 'Sport Response' button in the centre of that mode dial acts like a push-to-pass function, delivering a 20-second burst of maximum performance response from the engine and transmission.

Suspension is by struts at the front and multi-links at the rear, with ride height dropped by 10mm and the standard 'Porsche Active Suspension Management' (PASM) system able to adjust the dampers through 'Normal' and 'Sport' modes.

Ride comfort is harsh, even in the most comfort-focused setting, but that kind of goes with the Carrera T territory.

The steering is pretty much perfection. Precise and accurate, with amazing road feel, it allows the old 'think your way through corners' syndrome.

Speaking of which, this car chews up and spits out twisting B-roads without a hint of drama. The front end sticks and refuses to let go, the big 305 rear rubber following suit.

It remains resolutely planted, balanced and adjustable on the throttle, the standard torque vectoring set-up and locking diff turning go-fast wannabes into bonafide apex predators.
  
Standard rubber is Z-rated Goodyear Eagle F1 (245/35x20 fr - 305/30x21 rr) which is 10mm wider than the already generously shod 911 Carrera.

Braking is suitably beefy with 330mm ventilated and cross-drilled rotors all around clamped by four-piston aluminium monobloc fixed calipers front and rear.

We got the bit between our teeth at various stages of this test and can confirm the brakes are able to wash off speed rapidly and consistently with a reassuringly firm yet progressive pedal.

Under the heading of miscellaneous observations, the optional 18-way adjustable Adaptive Sports Seats fitted to the test car are brilliant. Comfortable for cruising, they can be dialled up to King Kong levels of grip when required.

A super useful feature is the ability to adjust the passenger seat with the driver's seat controls. So convenient for setting things back to normal after the co-pilot has cranked forward to accommodate a rear seat passenger.

The GT sport steering wheel is just right in terms of its diameter and grippiness and the overhead 'Surround View' function helps when manoeuvring a low and wide-hipped car like this one.

One of the key differences between the B4 and M4 is the ride. While the M4 can crash over bumps and generally be a little hard to live with, the crew in Buchloe have gone after a much more plush ride. And in that they have succeeded because the B4 S is a mighty fine cruiser. Bumps are dismissed with a haughty disdain, even Sport + silliness doesn't completely write-off ride quality.

Very impressive too, is the steering. While still not at Lotus Elise levels of feel (few cars are), the Alpina tweaks connect the your palms to the road with more clarity than what you'll find in the 440i or M4. Where the M4 particularly adds too much weight, the 440i is a bit more circumspect in that regard.

And then we come to the engine. The B58 six is a belter, better even than the N55 that preceded it. It's still a 3.0-litre straight six but is part of BMW's modular engine family that starts with a 1.5-litre triple in the Mini and 1 Series. The Alpina-spec turbos are noisier, the Akrapovic exhaust lighter and also noisier. It doesn't have the all-out crackle and pop of an Audi or Merc (perish the thought), but when you're on it, the B4 means business. The 660Nm of torque, available over a wide rev range, delivers a steel fist wrapped in a velvet glove and bubble wrap - the speed builds rapidly but smoothly. 

The approach to the chassis tune seems to be based on the driving talents of mere mortals on normal roads, which is kind of like the 440i. It's terrific fun to drive hard but it's very forgiving and patient. The great thing about it is that you wouldn't think twice about jumping in it for the long haul, so comfortable and quiet is the cabin. The M4 will leave it for dead on a winding road, but that's perfectly fine.

One irritant is the replacement of the admittedly cheap BMW gearshift paddles with weirdly non-tactile buttons. They're not particularly easy to use and, probably worse for a sporty car, unsatisfying. It's an odd detail with which to go off the reservation. Cheeringly, the eight-speed ZF is its usual perfect self, so you don't have to worry too much about manual mode or go old school and use the shifter.

The Alpina ships with six airbags, ABS, stability and traction controls, ABS, stability and traction controls, forward collision warning, forward AEB, road sign recognition and active cruise control.

There are also two ISOFIX points in the rear. Neither the Alpina nor the 4 Series has an ANCAP safety rating.

Porsche's three-year, unlimited-kilometre warranty is off the pace now, although the paint is covered for the same period, and a 12-year (unlimited km) anti-corrosion warranty is also included.

'Porsche Roadside Assist' provides 24/7 coverage for the life of the warranty, and after the warranty runs out is renewed for 12 months every time the vehicle is serviced at an authorised Porsche dealer.

The main service interval is 12 months/15,000km but no capped-price servicing is available, with final costs determined at the dealer level (in line with variable labour rates by state or territory).

Alpina offers a two-year/unlimited-kilometre warranty which is a bit behind the times and not in keeping with the price point. Servicing is another matter altogether and you're subject to your dealer's standard charges for servicing.