I didn't do the install myself but was there for part of it, the shop needed to neck down the size from where the collector exits to where the stock catback needed matching up - JBA includes flanges or some kind of connection pipe but they didn't work, had to do some minor welding and cutting. No big deal if the shop knows what they're doing.
Great sound @ startup and once warmed up no drone and pretty mild
'08 GT sport/premium, tints 20/35, 18" TSW nogaros w/ bridgestone blizzak winter, 19" sport oem w/ hankook evo summer, Philips crystalvision bulbs, debadged, Vararam OTR, JBA 1-3/4" LT's, ported TB, MF axlebacks, MF X-pipe, DBA-powerslot brakes, russel SS lines, hawk ceramic pads, GXP shocks/struts, lovells poly strut mounts, Slowhawk Tuned 344/356
Gone -'04 GTO A4 2.5" custom exhaust, sweet thunder muffs, H pipe, Z06 heads, Baer brake it, 20% tints, torrid red, AEM brute force intake, tuned