Installation done. Bitch getting the OE downpipe out past all the PP diff hardware, but puzzled that out with some skinned forearms. IE slid right in, fits perfect, clamp almost touches (this thing use any type of gasket?), and slid onto bracket without much fuss once i figured out the trick. Just hang on outboard bracket mount and "swing" onto inboard bracket mount. Flange will line up and clamp slides right on. Tried doing it by hanging on inner bracket mount, lining flange up and clamping loosely, then trying to mount on outboard bracket mount. No go. Everything else went fine.
Sounds pretty damn good connected to OE resonator/catback, at least for now. No drone whatsoever. No CEL with JB4, so no spacer needed. Doubt it will even with no tune due to near OE placement of high flow cat and O2 sensor. Got it on sale and had $500 Visa gift card I won to spend so was a good choice. Otherwise, I was eyeing Jake's set-up. All in all I'm happy and feel its a solid unit. Anyone considering it will be pleased.