johnboy105

I have this exact same setup (Borla Pro XS swap and resinator deleted). For the resinator, I had the same shop delete it as putting in the Borla. I had only done the Borla first (same as you) and thought it was a bit quiet too... I after the resinator delete, I was worried cause the guy at the shop tested it himself and his comment was, "meh, it's not "that" much louder..." but I found that it was 'just' enough. For parts, seeing as I had the shop do it, it was literally just a foot (or so) piece of 3" 304 stainless pipe that he welded in place of the resinator (to go over the outside of the stock 2.75" pipe on either side of where the resinator was and then some really good welds). The tone doesn't really change, but I did notice that in V4 mode, there was more of an annoying drone (due to the missing flapper from the Borla swap in the first place). I had planned eventually to get a Range device (to eliminate V4 mode altogether) so I starting looking around and I managed to hit a stroke of luck with someone selling a used one locally (as shipping/duty to get one of those across the boarder was really going to make a big dent in the pocket book....). Now I'm V8 only and it sounds pretty close to that video with the Tahoe - fuel mileage barely changed, to the point where it was hard to tell if the V4 mode was really worth all the design work GM put into it. I don't have a video clip yet, but I've mean to do one ... just haven't got around to it yet.

I've got 2.25" level up front, and 275/60/20's now and i'm rubbing the UCA's as well, and looking at wheel spacers - Steve, what brand of spacers did you get?

Found it in this thread: You'll need to read through the first few pages to get the idea of what to do. Deets for the cargo lights are in there.

Oh and picked up a Range device as well... the V4 noise was noticeable and 'some-what' irritating after the exhaust mods, but not huge. Found a used Range for basically half of new and gave it a whirl.... actually fairly impressed with how well shifting has improved with V4 being disabled.

Fog lights on with parking lights - DONE Cargo lights on with reverse lights (so that unlocking from the remote turns on the cargo lights in the bed) - DONE Soft fold tonneau (pulled from a trade at the dealer) - DONE Stone deflector (added at dealership, part of the deal) - DONE Weathertechs front and back (referral deal with dealership, only paid for the rear) - DONE Full tint - back added additional 35% to factory to make near-limo tint, front driver and passenger just a straight 35% - DONE MBRP polished stainless exhaust tip - DONE Custom cat-back exhaust - Borla XR-1 muffler to replace stock and resonator deleted - DONE ProComp 2.5" level kit in front, 3" ReadyLift block kit in rear - DONE Pioneer 10" TS-W261S4 350W subwoofer w/Rockford T400-2 400W 2-channel amp (used an AudioControl LC2i to get line level audio out of stock stereo) - DONE Custom 12V power port in the box near the tailgate - wired into the 12V supply line from the trailer 7-pin connection at the bumper - DONE To Do: USB charge only ports for rear seat (install into back of armrest/console) Black bowties Multi camera interface to add cameras that can display on factory screen, with sideview cameras and front camera. aFe Momentum GT Cold Air Intake System w/Pro DRY S Filter and..... some new tires (stock Goodyears are 'poop') - likely BFG KO2 275/60/20 (increasing size to 33" to take advantage of lift)

I have this all the time.... I had taken it in to my dealer and there was a software update for the trans, which they applied - it seems to help a 'bit' at first (definitely not a complete fix), but after a bit of time (oh say a few weeks), I couldn't really tell any update had been done. My "fix" would seem likely a bit extreme by most here, but I've just traded for a 2018 LTZ Z71 (that has the 8-speed by default) and with a test drive, I found a HUGE improvement in the trans response on that 8-speed. I know the 8-speeds of 2014 through 2016 or so had plenty of problems, but the 2018 LTZ Z71 I drove was surprisingly perfect.