When I built mine, I used 4" piping that had a 4" CLR. The pipe was 12" overall width on the 180 bend. They were mandrel bent 90's I got from a muffler shop.
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'98 3500 2wd, 24v, 5 spd, p-pumped
'98 2500 4wd, 12v, 6 spd, VP'd
'02 VW Jetta, 5 spd.
My p-pump conversion pics
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