Originally Posted by redlinedbimmer
some people seem to get amazing results with this mod and claim 40hp
and some of them even back it up with dyno charts
For me, headers are out of the question, since it will make the car fail the visual part of the emissions check in california. If someone comes out with a CARB approved header, I would consider it.
But if you don't have to worry about that in your area, headers would also give a good bump in power.