A thicker headgasket is going to lower your compression ratio slightly. This may also increase reliability due to a lesser chance of detonation. I would definately replace the headgasket while the motor is out. Its only like $225 w/studs and doing it now will save you many hours in the future.
If you only want 300 whp, the gt28r is going to be fine hitting 13s/12s, no point in spending more. The 2871r will put you well over 300whp and get you into 11s.
You need to make sure you know what you want because swapping setups will be costly because you will need bigger injectors (740s) for a 2871r.
Last edited by garbury; 12-01-2006 at 03:06 PM..
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