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Old 05-26-2020, 02:41 AM
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lust4speed lust4speed is offline
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Join Date: Jul 2002
Location: Yucaipa, SoCal
Posts: 8,684
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If additional restriction was needed (like a smaller exhaust pipe) then no one would be drag racing with open headers. I've experimented with adding sections of the same size pipe trying to tune the open exhaust, but have never seen any improvement from 12" to 48" extensions. The tuner pipe didn't slow me down but didn't help either. On the 525ci drag car at events requiring mufflers, I run a little more than a tenth slower with race mufflers the same size as the collectors. I have a bridge to sell you if you believe that I could bolt on a smaller pipe and smaller muffler and not loose a bunch more.

As far as I'm concerned the theory of having too large of an exhaust is a wife's tale.

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1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.