'07 LBZ Best Exhaust Mods - Chevy and GMC Duramax Diesel Forum
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Old 12-26-2012, 05:09 AM   eBay Motors  #1 (permalink)
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'07 LBZ Best Exhaust Mods

New to the forum, and I'm trying to decide how best to spend my Christmas money for the 2007 CCSB I purchased a month ago. The truck is all stock and I will be pulling a 10,500 lbs fifth wheel camper with mom and the kids. I want to add a performance exhaust without too much noise. I'm thinking of the DE quiet tone downpipe back exhaust with muffler. Any thoughts on that or other suggestions? Also, would a 3" downpipe add much noise? And if not, then which downpipe is best for fitment? I've read that they are now leaving the tab that bolts the downpipe to the exhaust manifold off. Is that ok? Future mods will be a transgo jr. kit and EFI Live by Nick. Thanks!
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3" AFE Downpipe & 4" AFE Stainless Steel Exhaust
18" x 9" Ultra Predator 8 Wheels / Cooper Discoverer AT3 275/65 R18 Tires
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Old 12-26-2012, 06:16 AM   eBay Motors  #2 (permalink)
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I hear good things about the diamond eye.


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Old 12-26-2012, 07:53 AM   eBay Motors  #3 (permalink)
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The Diamond Eye QT exhaust is a great choice if you want to keep it quiet. Adding a down pipe won't increase your sound much. I would go with a Pro Fab DP. It has a tab that mates up and works.
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Old 12-26-2012, 11:55 AM   eBay Motors  #4 (permalink)
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I recently purchased and installed 4 inch straight pipe on my 07 Lbz and surprisingly enough it does not have much drone in the cab at all even when towing a heavy load. It sounds like a screaming fifteen year old girl though. Your turbo will be surprisingly loud. A down pipe will get rid of that Lbz turbo hiss though.
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Old 12-26-2012, 11:56 AM   eBay Motors  #5 (permalink)
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Mine is an mbrp turbo back straight pipe and I believe it cost right at 3 hundred bucks.
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Old 12-26-2012, 12:24 PM   eBay Motors  #6 (permalink)
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I have a full stainless magnaflow with muffler, 4 inch, and its not to loud at all. The tone is nice when you get on it but fairly quiet at idle or easy throttle. Nice system.
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Old 12-26-2012, 12:39 PM   eBay Motors  #7 (permalink)
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i agree on the magnaflow 4" the best fit easiest to install and also the most quiet. shes only loud if you get on it.Ive installed silverline on my dads lbz and a mbrp on on a ford all were turbo back the silverline came into contact with the body and i had to mash up the heat shielding on the bottom of the bed to keep it from ratling when the exhaust got hot. The mbrp was a nice kit but hard to work with due to it being aluminized. . if you decide to go aluminized make sure you you test fit it all first cuz once those clamps are on thats it there not coming off.
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Old 12-26-2012, 01:20 PM   eBay Motors  #8 (permalink)
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I have a dual 4in DE with 3in downpipe. It is not too loud at all. It has barely any cab noise when cruising but when you get on it, its loud!
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Old 12-26-2012, 07:54 PM   eBay Motors  #9 (permalink)
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What will a down pipe gain me? would it be a good addition to the mods in my sig? or wont it help me? sorry im new to the diesel world
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Old 12-27-2012, 05:42 AM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by Dura View Post
What will a down pipe gain me? would it be a good addition to the mods in my sig? or wont it help me? sorry im new to the diesel world
A 3" downpipe will drop your egts down about 100 degrees and give you a little better fuel mileage. It also takes that jet plane sound out and gives it a deeper tone. Very glad I did it to mine. I have an mbrp on mine only cause it was super cheap, but it didn't fit very good. I had to file the mouth of it quite a bit for it to fit into my turbo. Diamond eye and flo pro make nice ones for cheap. Look up pictures of stock vs aftermarket, it'll blow your mind on how restrictive the stock one is.


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