What did you do to your NNBS GMT900 Tahoe/Yukon Today?

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Charlie207

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Tonyrodz said:
I had drone with my MBRP, thank God it rotted out. Forced me to get another, quieter muffler. No more drone.<----This statement is how I know I'm getting old lol.
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So what did you go with? I'm toying with mufflers to leave the bark, but minimize drone in the SUV cabin, especially in the rear seat area. For some reason the drone is much worse back there.

While looking for Doubeleive's Borla on ebay I stumbled on this curious muffler, and am thinking about picking one up to experiment: https://www.ebay.com/itm/394550775597

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Doubeleive

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Charlie207

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Doubeleive said:
@iamdub made a hemholtz mod like that
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He did! He provided some links to the formula calculator that let you design your own, if you knew the variables, like engine size, drone @RPM, etc...

I actually spent some time looking for a part that was only the resonator tube attached to a short section of exhaust, so I could fit it inline with my muffler, and not have to mess with too much fabrication.
 
Tonyrodz

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Charlie207 said:
So what did you go with? I'm toying with mufflers to leave the bark, but minimize drone in the SUV cabin, especially in the rear seat area. For some reason the drone is much worse back there.

While looking for Doubeleive's Borla on ebay I stumbled on this curious muffler, and am thinking about picking one up to experiment: https://www.ebay.com/itm/394550775597

View attachment 441602

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Click to expand...
I don't remember what I went with. @iamdub actually suggested a knockoff of a major brand. Made by AP I think. Sounds good and it was cheap.
 
Charlie207

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Tonyrodz said:
I don't remember what I went with. @iamdub actually suggested a knockoff of a major brand. Made by AP I think. Sounds good and it was cheap.
Click to expand...
I have an AP muffler, and I think it may have been the same one. It definitely has less drone than the MBRP clone muffler I have installed now, but it quiets down the overall sound as well. I wish I could have my current sound, but less interior drone.

Might buy that QW muffler and play around.

The other thought is to buy the short version, but also grab another short, but wider, muffler/resonator in case the QW muffler is obnoxious. I wish mufflers had a strong 2nd-hand market like gun parts, lol.
 
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I replaced the clamp but it didn't help much. the joint looks like a good design, the clamp just bottoms out before it gets tight enough.
 
Charlie207

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j91z28d1 said:
I replaced the clamp but it didn't help much. the joint looks like a good design, the clamp just bottoms out before it gets tight enough.
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That, and the bolt and "nut" rust to shít in a year.

I feel like there should be a tapered seal that fits in the normal joint to help seal it up.
 
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I believe there was a youtube guy that did the drone mod. he get into the sizing. said it worked well.


I have what gm calls the nnp exhaust on my car they have valves that open and close controlled by the ecm. I wish everything had it, it's the best of both worlds.
 
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