The 3.5" tail pipes are custom. But 2.5" tubing is tiny compared to a 3.5" tube. The 3.5" come nowhere near the anti roll bar. It is closest to the upper control arms. The down bars are moved in towards the center section just to help with tail pipe clearance. So clearing any production exhaust should be no problem. My old 2.5" Dynomax tail pipes would clear with no issues at all. I would bet the MAC and Flowmaster 3" systems would fit. I know Kevin has had many customers test and use these. I bet he would know for sure it will fit.
Mike 1986 Capri street car w/ a/c, p/s & p/w
Custom built T6 80mm s400sx based kit Shaunthony's built (Twin Trouble and Anthony Fury)
9.31 @ 146 1.39 60' on drag radials @ 3735# Kurgan tuned AEM EMS
80mm 718rwhp new 88mm 921rwhp No new track times yet