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Old 04-21-2020, 01:36 PM   #2
tubman
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Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,319
Default Re: Exhaust diameter

About 25 years ago, I spent a lot of time and effort putting a 2" system all the way back on a '36 I had. (The car had a set of Fenton headers). Later, I found out that not only did it not help anything, and produced a "hollow" sound that was inferior too that which smaller pipes produced. I have heard that 1 1/2" pipes are just about right for dual "straight pipes" on a flathead.

And let's face it; modified exhaust on a flathead is more about "The Sound" than performance.
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