Tonyrodz
Resident Resident
Gotta upload to youtube, then post the link.
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
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iamdub
Full Access Member
I see that! I'm like a caveman stepping out of the cave for the first time. The fisheye view is a bit annoying. But the vid quality and sound is pretty on-point. Post with vids coming soon...
iamdub
Full Access Member
Got it! Post coming soon...
iamdub
Full Access Member
Replaced the stock 80-lb. trash can of a muffler with an AP Exhaust XS1259.
Made some comparison vids. Slow rev to limiter (4,000 RPM, I think) then a few WOT blasts to limiter.
Before:
After:
Honestly, it's much less aggressive than what I wanted. With the muffler being about a 1/4 the size of the stock one and almost straight through, I expected it to be louder. My best description is that it's basically the stock note/tone, but with the volume turned up one or two clicks. Comparing the videos, the XS actually sounds quieter. It's definitely louder, but deeper. Very smooth and mellow. Maybe the camera recorded the sound differently? The sound it gives off seems to cancel out the growl from the MIT. When cruising, it sounds almost 100% stock and you can barely hear a deep rumble coming from behind you. It's definitely noticeable when you mash on it, but it's still not as aggressive as I was hoping for. I'm gonna run it and see if it changes it's tone with age. It may end up being perfect after the packing gets a little clogged and with catless long tubes. If not, I can easily switch to a chambered style like that Jones one @kbuskill has.
Made some comparison vids. Slow rev to limiter (4,000 RPM, I think) then a few WOT blasts to limiter.
Before:
After:
Honestly, it's much less aggressive than what I wanted. With the muffler being about a 1/4 the size of the stock one and almost straight through, I expected it to be louder. My best description is that it's basically the stock note/tone, but with the volume turned up one or two clicks. Comparing the videos, the XS actually sounds quieter. It's definitely louder, but deeper. Very smooth and mellow. Maybe the camera recorded the sound differently? The sound it gives off seems to cancel out the growl from the MIT. When cruising, it sounds almost 100% stock and you can barely hear a deep rumble coming from behind you. It's definitely noticeable when you mash on it, but it's still not as aggressive as I was hoping for. I'm gonna run it and see if it changes it's tone with age. It may end up being perfect after the packing gets a little clogged and with catless long tubes. If not, I can easily switch to a chambered style like that Jones one @kbuskill has.
Last edited:
Drok
Full Access Member
Sounds good.
I went right to my limit of loudness. If it was a few db more id probably take it off haha.
I went right to my limit of loudness. If it was a few db more id probably take it off haha.
Sounds good but what’s a rev limiter lol. Need that tuned out so we can hear it at 5500.
iamdub
Full Access Member
I don't know about NBS, but the NNBS has a limiter at around 4,000 when revving in park or neutral. For me to get a 4,000+ RPM clip, I'd have to be driving. Maybe I'll get a body mount for the GoPro and make more vids. Sounds fun.
I had mine removed by Blackbear.
mikeyss
Full Access Member
I never thought about doing that, lol. I guess when I get my long tubes, I'll update my tune for those and remove that park rev limiter, lol
Regency
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