Changing Headers

[MattF]

How much more power will this add to your car if you switch to aftermarket ones and what brand would you recommend?

 

[BillBoost37]

With an NA, you need restriction to help build torque. With headers, you would likely feel like you lost power.

 

[Z34Phoenix]

i never did drive my 3800 NA with stock manifolds so i dont know for sure, but with speed daddy headers it moved quite nice! i would look at all headers and find ones with smaller primary tubes. this will help increase exhaust scavenging. this is what most refer to when they talk about back pressure or restriction needed to retain tq.