Thread: Exhaust Diameter Recommendations

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Well maybe I hit it right with the 2.25" diameter just copying from IC2. The shop I went to did not use the H-pipe kit I bought from Speedway which I measured today and found it was 2.50" diameter. But I asked for 2.25" diameter and that is what I got. The initial system on my car is 1 5/8" diameter tight fit tubular headers with ceramic coating. For a shop, the welds are not that smooth but they are not visible unless you really look under the chassis. Back when I was really young on a full scholarship I invested in every book in my field that I could find and benefit even until today using those classic reference books but I still had a little money left and used to buy Bavarian brown beer at $6/six! Years later as a married family man on a budget I found "Old Milwaukee" for $1.97/six and that price held for quite a few years in the 1980s. There is a lot of attention paid to where water comes from for beer and the local beer where I grew up was Ballentine Three Ring for all the Philly games but Valley Forge beer in the suburbs which unfortunately drew it's water from the upper Schuykill river which at that time was at least 20% coal dust but the price was low; maybe the all the coal had a charcoal filtering effect? By the way "Todd", the top guy at the Economy Muffler shop, said he had personally done many, many dyno runs to optimize H-pipe position and pipe size and his opinion is that the H-pipe does nothing! That reminds me of the Preacher who had a horseshoe over his door for luck and one of his congregation wondered if he believed in the luck of the horseshoe. He replied that he did not believe in it but folks said that it worked even if you did not believe in it! Maybe that is how an H-pipe works?

Don Shillady
Retired Scientist/teen rodder