The first exhaust I had was a side exit under the rear quarter panel and stock programing. It still would turn my old cudy cabin a black/grey on long road trips. I honestly think the only way is to get it as far back and as low as possible, I just don't know how to do it and still be ascetically pleasing with out doing a temp "towing" exhaust.
currently running a smarty. It can be pretty dirty if I run it on kill, and can't remember the last time I had it loaded with a crazy heavy fueling tune. I'm wanting to get a the UDC dongle, but don't know to much about it since I have fell out of the "mod your truck crowd" guess getting older you get more boring. I've also ran superchips, edge juice w/attitude and edge EZ in the past.
Bowz
03 SSV 1180FWD, 750'S AFT, ACME1433, GETTO GATES FOR BOTH SIDES
05 CUMMINS EXTRA AIR AND EVEN MORE FUEL (MAIN TOW RIG)
08 FJ TRAIL TEAMS ED (10 MIN OR LESS TO THE RIVER TOW RIG)
01 JETTA TDI