Headers are terrible to work with on Pontiacs in general and especially on FGF's. Headers are for Chevys. There is really not that much gain unless you are screaming down the track at high RPM trying to wring out all the power you can. For normal driving, not so much. Stick with the stock logs or if you really are determined to do something fancy get some long branch cast iron headers. Just my opinion. Trying to save you some grief.