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  1. Sean Michael

    Is New Engine Break In Procedure Still Necessary?

    I was wondering if the redline reduction was visual only in the guage cluster or actually enforced by the ECU, I didn't test the theory because I was following break-in procedure sincerely and kept it under 4,500 RPM anyways. In your experience with your Corvettes, did you feel any difference...
  2. Sean Michael

    Is New Engine Break In Procedure Still Necessary?

    I bought a new Cadillac CT5-V and the digital guage cluster shows a reduced redline for the first 500 miles, there's video on the Cadillac forum of someone hitting 500 miles on the odometer when the redline immediately jumps up to normal. So GM can and does implement some programed break-in...
  3. Sean Michael

    I had the GM Performance Exhaust installed

    I could've kept my Tahoe and bought the CT5-V as a second car for less than $150K!
  4. Sean Michael

    I had the GM Performance Exhaust installed

    I enjoyed my 6.2L with the performance exhaust that I made this post about. However, the power it provided was a gateway drug so to speak, I went for even more performance and traded it on a 2025 Cadillac CT5-V last week. I'll miss the 6.2L rumble and copius interior space, but the V Series...
  5. Sean Michael

    New 2024 Yukon XL Denali

    I did it, traded my 6.2L Tahoe on a 2025 Cadillac CT5-V yesterday. Had it delivered with 4 miles on the odometer and it's even the same color as my Tahoe, GM's Radiant Red. Completely different direction going from a full-size SUV to a performance sedan, but I had been yearning to get back into...
  6. Sean Michael

    New 2024 Yukon XL Denali

    I'm bummed to be leaving it behind, and knowing my luck GM and NHTSA will go public with a bulletproof plan to fix the issue a day after I trade, but at this point I've already got a trade-in offer on paper, negotiated the price on a different new vehicle, and now I'm just waiting for it to be...
  7. Sean Michael

    New 2024 Yukon XL Denali

    Being paranoid, having to baby these vehicles, adding aftermarket disablers, following specific startup procedures, using L9 all the time and whatnot to keep these temperamental 6.2L engines from grenading is ridiculous. I've come to the realization this isn't what ownership of a new $80K+...
  8. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    And to be specific, it was assembled late August 2024, so it hadn't sat on the lot, I bought it right off the transport truck.
  9. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    Approximately 5,000 miles with one oil change at 3,000.
  10. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    @blanchard7684 2024 Tahoe RST 6.2L purchased new last September.
  11. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    I'm trying not to be neurotic about it, but the fuel pump control module leaving me stranded wasn't a rare fluke, it's a common issue and there's even a thread on this forum about buying and keeping a spare one in the vehicle. I'm not too concerned about the lifter issues everyone talks about...
  12. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    I really enjoy my 6.2L RST, but after the FPCM left me stranded on the 6th day of ownership at only 320 miles, and now the reports of bearing failures, I'm beginning to lose confidence in the vehicle. I started kicking tires on other vehicles just to see what else I would drive if not a Tahoe...
  13. Sean Michael

    NHTSA opens preliminary probe into more than 870,000 GM vehicles

    I'm not experienced with engine building, but I watched that video when it came out and a lot of commenters on the video were saying it apeared to have already been rebuilt because of the presence of a heat tab, it had too much carbon build-up to have only been a 4-mile engine, and the fact...
  14. Sean Michael

    Sunroof Rattle

    Did you ever resolve this? I'm having the exact same issue.
  15. Sean Michael

    Passenger side of sunroof rattles

    The passenger side of the sunroof on my 2024 Tahoe rattles, especially when it's cold. I have narrowed it down to the sunroof because the rattle sound goes away when I reach up and apply pressure on it while driving. I can also limited the rattle by using the "tilt" setting that slightly opens...
  16. Sean Michael

    I had the GM Performance Exhaust installed

    If the GM exhaust and CAI was an available option from the factory for $2,200 when I bought mine, I would've done it in a heartbeat. The exhaust alone is listed at ~$3,300 on GM's site when done after the fact, but I paid around $2,700 because they were running a 20% off sale through year-end...
  17. Sean Michael

    I had the GM Performance Exhaust installed

    To be honest, I don't track my MPGs, but I'm guessing that a less restrictive exhaust could theoretically increase efficiency if driven in a fuel conscious way. But that is hard to do, the temptation to hear the exhaust and enjoy the 6.2L's power is too enticing. I'll probably make an effort to...
  18. Sean Michael

    I had the GM Performance Exhaust installed

    @Jdchap1, I am enjoying the new exhaust. Tomorrow will be a week with it on, and I'm convinced GM's published hp & torque increase for their performance cat-back system is real. I read comments about how exhaust, even cat-back systems, don't add much, and I think those people have good...
  19. Sean Michael

    2025 RST Test ride

    If I'm test driving a loaner or demo of a new model or refresh to see if I'm interested, I'm going to find out how it moves. But if I'm test driving a particular vehicle because it might be the one I buy and take home, I'll take it a little easier, because I do like to follow proper break in...
  20. Sean Michael

    I had the GM Performance Exhaust installed

    On my original post I mention that GM claims the GMPP exhaust "Helps increase power by up to 11 HP and 6 lb.-ft of torque" and "30% backpressure reduction at 300-g/s, based on correlated flow testing" (those qoutes are directly cut & paste from their website). I was sincere that it was a...
  21. Sean Michael

    2023 Tahoe Lift Gate issues

    My previous Tahoe, a 2019, had an issue pop up where the back glass did not open but the gate still worked. It ended up being a loose fuse, not blown, just loose. I fiddled with it and the problem went away. Check you fuses.
  22. Sean Michael

    I had the GM Performance Exhaust installed

    When exhaust breaks in does it usually break in louder, or quiet down, or just change tone? I'm on day 3 with this new GMPP exhaust and I can't tell if it sounds a little louder or I'm just giving it more gas more often because I love hearing it.
  23. Sean Michael

    I had the GM Performance Exhaust installed

    I was able to drive some more today while running errands, and you're spot on. With the radio off and paying attention, I can hear the DFM kick in under 55 or so, and I know it's the DFM because I hit L9 on the shifter (which deactivates DFM) and it went away immediately. And then over 65 the...
  24. Sean Michael

    I had the GM Performance Exhaust installed

    Yes, my vehicle is unmodified besides the GM exhaust upgrade, so it has cylinder deactivation like any other Tahoe. You remind me of another reason I chose the GMPP version of exhaust though. The GMPP version still has the exhaust "flapper" included to help minimize drone during cylinder...
  25. Sean Michael

    I had the GM Performance Exhaust installed

    I asked questions here, watched every video I could find on YT, and read as much as I could about the GM exhaust options, and after much consideration I ordered the GMPP exhaust and had it installed today. Specifically the GM Performance Parts exhaust, NOT the GM by Borla exhaust. Some...

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