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Old 11-19-2014, 07:12 PM   #10 (permalink)
undeRGRound
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Quote:
Originally Posted by Madact View Post
Yes, I'm looking at 1.5" primaries, it's the smallest size that matches the port area.
Should be the best case
We always strived to avoid a "Reverse Step" or neck down with a step in exhaust ports.



Quote:
Originally Posted by Madact View Post
Great idea about using half of an ebay 4-2-1, that just might work.
Don't think I had any input here, but splitting a 4-2-1 into two 2-1 headers and then running them into an X-Pipe would achieve the ASC design.

Here are the pics I promised, all for the bikes but it applies most to a 4 cylinder





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