09-12-2009, 08:47 AM
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CC Member
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Join Date: Oct 2000
Location: Crystal Lake,
IL
Cobra Make, Engine: Everett-Morrison, 434 cid
Posts: 977
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Not Ranked
Built my own exhaust from header flange to turn-out. 1-7/8 to 3-1/2 collector, w/tapered transition into a 3" x 18" perforated core straight through muffler, and 3-1/2" turn-out. I wouldn't do it again (too much work  )... next time I would have somebody else build it, only with merge collectors.
Motor drives and responds to tuning same as with open exhaust. This is on a 430" motor with a very large solid roller, a single DP 4 barrel, and locked timing (670hp). Original sidepipes were Lobak spiral cores. Although quiet, throttle response was terrible. In fact, I ran more timing to compensate for the diluted intake charge caused by the excessive (for my combination) backpressure.
Re: "flapping noise" on decel; I dont have any with this system. But, FWIW, I have louvered baffles in a 2-1/4" pipe on my Harley and it "flaps" like crazy. Remove the baffles and it goes away?? |
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