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Exhaust Photo Reference Library.

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Schnell:
RC Russ Collins 4into1

Tom R:
77 cb750k head pipes with hollow reverse cones from eBay. I have some 1-1/2” perforated pipe to baffle them a bit.
I started putting this together when I was going to race my cB750 in the production heavyweight class, which requires a 4-4.
Instead I race my 400f in production lightweight and bump up into heavyweight… the 400f does just fine in both classes.
If I ever get this bike back together I think I’m still going to run these.

Nightshift:

--- Quote from: Tom R on December 23, 2023, 11:44:35 AM ---77 cb750k head pipes with hollow reverse cones from eBay. I have some 1-1/2” perforated pipe to baffle them a bit.
I started putting this together when I was going to race my cB750 in the production heavyweight class, which requires a 4-4.
Instead I race my 400f in production lightweight and bump up into heavyweight… the 400f does just fine in both classes.
If I ever get this bike back together I think I’m still going to run these.

--- End quote ---
Tom, who did you buy these 4-4 from? I don't see them on FleaBay. I need 2 sets. Bill

Tom R:
https://www.bmikarts.com/Reverse-Megaphone-Cone-Muffler_p_5227.html

They’re hollow. Probably too loud to stay under 100db for racing even.

Dime:
No markings that I can tell but the exhaust sure looks like the Amen Savior ad posted on page 2 of this thread

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