Just got an 06 GT..

seattlegt said:

Congrats! A induction system like Demolete's "Tunable Induction" and a SCT tuner(sold as a package for around $575) will add about 20hp with a 87 octane tune and 25hp with a 93 octane tune. Add gears (I have 4.10s) for about 450-700 and you will have one fast car. Underdrive pulleys will give you another 8hp and a straight throug axle back will give you another 7-10hp (I've seen 2 Corsa dynos and they are in the 12hp range while Mustang and Fast Fords rated Borla stingers at around 10hp after some dyno tests. Corsa's are the most $, but I just saw them online with free shippping for $592. Others are around $400-500. Flowmaster and other "non striaght through" aren't gaining any power on the dyno, but improve sound. I'd throw a set of springs (about $450-500 installed) and maybe some aftermarket wheels. I decided to stick to 18s for both price and most importantly performance. The additional wieght of a 20 is like adding 200-300lbs to your car based on physics as the mass increases and moves farther from the center point of rotation.. Well, that's my 2 cents! Enjoy and have fun with your new baby

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