Thrush Glasspacks

[Project Mean Green]

lol yeah, screw autozone knowledge...

I found out why backpressure is important though... it gives your O2 sensor the ability to communicate and tune your engine better.. zero back pressure can throw a "too lean AFM" code...

My truck didn't do that and it sounds deep and throaty. I dumped them after the cab


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[Jorge6.5]

Where do the tail pipes exit ?

How about some video?

 

[Project Mean Green]

Where do the tail pipes exit ?

How about some video?

I didn't have time to get a video and I have no tailpipes. Right after the cab I just clamped those suckers on there.


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[Jorge6.5]

That's how the exhaust was in my truck when I got it. Was awfully loud in the cab, got headaches and couldn't even have a conversation while driving the truck

 

[Project Mean Green]

That's how the exhaust was in my truck when I got it. Was awfully loud in the cab, got headaches and couldn't even have a conversation while driving the truck

Really? Mine surprisingly isn't very loud but then again I haven't broke them in yet and have a minor leak on them both that I am clamping tomorrow. But yeah it's loud but not in the cab.


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[phule]

How long did you go. Im looking at some 29" glasspacks.

Adam

 

[Project Mean Green]

How long did you go. Im looking at some 29" glasspacks.

Adam

I got 20 inch ones. 25 inch total length but 20 inch case length. Pretty deep and throaty I just sawzawed my MagnaFlow off and clamped it on. No pipes.


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[dylan94sierra]

Sorry to bring the old thread up but I'm pretty new to exhaust systems. I was thinking about straight piping my 94 5.7 and was thinking about glasspacks... Any thoughts to how it would sound? Right now I have stock 2.5 exhaust cut off just before the rear axle (I didn't do it) so I would just delete the cat and muffler. Whats the difference between glasspacks and cherrybombs

 

[kennythewelder]

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I have 24 inch thrush glass packs on my 97 5.7 Silverado. I like them. My truck is not loud, it has a deep rumble at idle. at wide open throttle it get louder. This longer glass packs are the quitter they will be. The shorter they are the louder they will be. Cherry bombs are short. Straight pipes have no restriction what so ever. Any muffler you can see through will not be restrictive ether, but any muffler that you can not look through is restrictive. (e.g. flowmasters). The better the exhaust flows, the more power the truck will make, but wide open exhaust is not good ether.(e.g. open headers, open exhaust manifold). The pipes and cats. provide enough back pressure to be ok to run no muffler.

 

[dylan94sierra]

Are yours welded on? I was hoping to get something I can clamp. Would I be ok to run straight pipes with no muffler and cat or would I need one or the other to keep some back pressure? Yours sounds like something I'm looking for, an aggressive tone at idle and loud when I get on it