Let's say you want a VW Golf GTI, a Jaguar XFR or even a Porsche Cayenne Turbo but you'd like to turn their performance all the way up to a 11.

Well, that's why you can get a Golf GTI performance pack, a Jaguar XFR-S and even a Porsche Cayenne Turbo S.

But are these highly tuned models really worth the extra cash? To find out Owen Mildenhall compares them on track with their standard versions.     

In this video the Jaguar XFR-S is up against the normal XFR.