[marcyeo]

Really depends on what you want out of the car and what sort of power delivery you like as well.

GS will give you more kw with a simple tune and exhaust as it really liberates the supercharged V8. Power delivery is also more linear and nothing beats the sound of the supercharger whine and V8 exhaust.

The FG MKII F6 (guessing that's what you are looking to purchase) on the other hand is a lighter car to drive and so the feel is different on the road without a heavy V8 engine in the front. Being a turbo the power delivery is more of a instant kick rather than the linear rush of the GS - attributable to the turbo lag/spool of course. So seat of pants feel is faster in a F6 because of the sudden kick of the turbo once it reaches boost.

Sound of the F6 is also nice - but more whistles and turkey gobble on lift off and air intake whoosh. Don't forget the F6 also comes with Brembo brakes ready to go and depending on whether you need them or not - I recommend them if you're going a tune.

I owned a previous F6 and it made 350rwkw with the mods in my sig for about $5000. I made 450rwkw in the GT (not the GS), and the GT ended up being alot faster, but it was about $15000 for the initial tune,exhaust mods, injectors, fuel pump and intercooler.