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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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Dave

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The results spoke for themselfs, I didn't beleive the first time slip either The second time slip and the other four did convince though When that car slowed down by adding the Bulllets that really gort me confused Sometimes theory and reality don't mix That is why we tests, correct