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Old 04-24-2012, 10:46 PM   #1
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Default Exhaust on a 2007 silverado

Hello, I am looking to install a new exhaust on my truck. I am planning to go with dual exhaust from the cats back, I plan to use cherry bomb glass packs. My question, where would the best place be to put the mufflers so that they kind of cackle when I back off the gas? I am thinking of runnin them all the way to the back and have each side exit, so that it looks factory. Thank you.
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Old 04-25-2012, 09:55 AM   #2
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True duals eh? Might I recommend some long tube headers as well, with an X-pipe right after? You'll have to relocate the cats to keep them.

Also, you'll have to run the pipes right next to each other down the right side of the truck due to the gas tank being on the left side, right before the axel you'll have to run the left pipe over to the left side of the truck. There is A LOT of aluminum/stainless steel involved in these setups.

Unless you're doing all of this yourself, you'll be looking at over $500 for aluminized steel or over $1000 for stainless.

To get the cackle you want you just have to have some short glass packs. 18" or shorter with the stuff knocked/cut out of them will do it.
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Old 04-25-2012, 10:58 AM   #3
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if you just want noise i would just strait pipe the muffler after the cat. all that stuff mouse said would be good for more power but you would have to get into the computer.
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Old 04-25-2012, 12:42 PM   #4
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I have looked into long tube headers, but think that may be a later project. I was plannin to stay away from straight pipes, not really a big fan of them, they usually dont have any tone to them. I also plan to get it custom tuned at a later date, also plan to super charge it, once I get a replacement truck. Thanks.
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Old 04-25-2012, 01:13 PM   #5
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you arent going to get that rasp noise with the glasspacks. when i put them on my firebird thats the only thing they took away. and ive driven trucks with stock cats and nothing else, i my opinion the oem cat takes away alot of the noise. not like running headers, and strait pipes. noise is subjective though, what sounds good to one doesnt to another.
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Old 04-25-2012, 11:40 PM   #6
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If you are keeping the cats I would just run resonators. True duals are acutally less efficient that a cross over system. A properly set up X pipe creates a scavenger effect that increases flow.
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Old 04-26-2012, 03:19 AM   #7
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What creates the cackle when coming off the gas is a lack of back pressure. Your nest bet is to get a high-flow cat (or take the cheap route and break out all of the filtering/resonating material in the factory one), straight pipe it to the back, then add the glasspacks.

That'* how we got that sound with my buddy'* Cobalt.
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Old 04-27-2012, 12:23 AM   #8
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Thanks guys for the replies. I was thinking of using the glass packs cause I got em for a steal, but may just keep em for another project and just see how straight pipes do with the factory cats. Heck, I can always add em later if not happy with the results.
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Old 04-27-2012, 11:47 AM   #9
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Quote:
Originally Posted by mark_k View Post
Heck, I can always add em later if not happy with the results.
Exactly.
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Old 04-29-2012, 12:26 PM   #10
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I have a Magnaflow catback on my truck. Sounds great, doesn't cackle when I shift (it'* a standard) or downshift. I have an exhaust clip in this thread...

https://www.gmforum.com/showthread.p...65#post1559565
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