Just bought a 2006 Sierra Crew Z71. The exhaust is a little loud for me. Can y’all tel me what kind you think it is? I’ve had flowmasters before, but ...

Just bought a 2006 Sierra Crew Z71. The exhaust is a little loud for me. Can y’all tel me what kind you think it is? I’ve had flowmasters before, but they are even throatier than them. Thanks guys!




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Still look like flowmasters. They have several different series. Some louder than others.


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Agree. There’s no cats either, may have them replaced with a quieter series.


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Thrush chambered
the earlier ones where plain, new ones have the iconic Woodpecker stamped in them.


https://www.thrushexhaust.com/mufflers/ ... ed-muffler

GrandPaJoe wrote:Thrush chambered
the earlier ones where plain, new ones have the iconic Woodpecker stamped in them.


https://www.thrushexhaust.com/mufflers/ ... ed-muffler

That’s it! I Youtube’d Thrush Exhaust 5.3 and it has the same “brap-brap-brap” sound mine has. Thanks man!


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Glad to help
and for what it's worth, the new ones sound better, I install them often and half (sometime over 50%) the price of Flowmasters.

Cool. Could I add a resonator and calm them down a little? I’m not very knowledgeable about exhaust [emoji51]. Thanks!


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They look like magnaflows, they look like trush, they look like hundreds of other brands. I don't think they are either one of the first two based on how much rust and those inlets look like they are squared. I see four pieces welded together to make that square inlet.

It looks like they also had to add that extra 2inch piece of pipe at the inlet, because other wise neither muffler wouldn't fit up in that hole like it should. (It also looks like they are too big). It looks like the front side is rubbing against the... (is that the) body, and did they cut a square out to make that fit? THATS why they are going to be overly loud if they are mounted against the metal. Have you noticed any other lazy fixes that might make you think its a generic mis-sized muffler from a half-ass muffler shop?

To ME: That looks like you need a new exhaust from the manifold back.

TennesseeBoy wrote:Cool. Could I add a resonator and calm them down a little? I’m not very knowledgeable about exhaust [emoji51]. Thanks!
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Doubtful without cats, though the newer ones are quieter, no cats will make any muffler louder.
Best option is a single in and dual out. Also replacing the cats would help, hows the low end trq?

@ Adriver
They're Thrush for sure, those welds are sloppy (to say the least) they were cut and removed from something else and patched in there. The early ones were OK and Thrush keeps improving them, there's a sound clip on their website.
A great muffler for the money