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DV. There's no problem doing the "traditional" bulge type sidepipe. It would be a 4.0" sidepipe, and a 4.50" bulge or bullitt. I don't think you could really tell from the stock 3.5" sidepipe, and the 4.0" muffler bulge. The bulge would be just for "looks." A full 4.0" OD sidepipe and baffle set up is what you would have.
Jack (Hotfingrs) did end up with a prototype 3.50" set of sidepipes, with the for looks only bullitt. Much better flow with the 4.0" pipes.
Anymore measurements for length's of different sidepipes is welcome.
I am going to make it down to the fling this year.....JCL
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