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Great info Charles!
Since the temp has droped here in Michigan I am noticing my engine to be a bit pipey. Funny, in the heat of the summer it seems fine.
I may just try the extending my headers to 12.5 inches  |
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It will make the pipes start boosting at a lower rpm.
I have seen Lee Morey's 110" Yak fly with stock length headers and it was great. I'm curious what is different. Maybe some of the headers are different lengths.