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My car is almost done, the only thing im waiting for is my headers:( The thing is that my "tune time " on the dyno is soon. And I wounder if I can tune the car with the STOCK exhaust and then just add headers later? Or must I retune it when the headers goes on?
Im new to this EFI stuff, but I am very experienced with carb'd cars. On a carb'd car , headers will require a tune up change due to increased cylinder scavaging. When I say require- I mean should be for optimal performance. Most people dont do this and seem to get away just fine. If I was paying for time on adyno to optimize my tune, I would have the headers you plan to use in place. :)