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So Cab, do you really think that in your example of going from 109 to 117 mph was because of the restriction of a perfectly good 2 1/2 exhaust system and nothing else? What is that, like 80 hp on a pretty mild motor?

I have more than one example of going from a 2 1/4 compression bent system to open headers that netted 2 mph in 12 second cars.

Obviously your experience is your experience, but logic suggests to me that possibly something else was at play in your example.

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Those mufflers where the old style Turbo muffs so who know how restrictive they are, I think I still have both sides of them intact from back then They where pretty crudely done (I didn't build those, they where on another car I had bought and I reused them on that car because they bolted up )I put a set of the race 3x14 Bullet header muffs on the car after getting beat and those rascals slowed that car down .1 and 1 MPH I had hoped that they would act like collector extensions and help the car go faster, but they dang sure didn't You have to test to learn