'07 LBZ Best Exhaust Mods - Chevy and GMC Duramax Diesel Forum

06-07 LBZ & LLY Performance Parts Discussion Discussion of Performance Parts For the 06-07.5 LBZ/LLY Duramax Trucks No Advertising

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post #1 of 23 (permalink) Old 12-26-2012, 05:09 AM Thread Starter
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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!

2007 GMC SLT Classic, 2500HD CCSB
Edge Insight CTS w/EGT Probe
EFI Live w/DSP5 switch by Duramaxtuner.com (Nick)
Pullrite Superglide 5th Wheel Hitch / DMI Quic 'n Easy Receiver Hitch
Transgo Jr./Allison Filter Lock
HD SynTran Tranny Fluid (John Deere's Syndtran)
Mike L. Transmission Cooler
Diesel Race Parts replacement Tranny Cooler Lines
2015.5 Style Tow Mirrors w/Dual Function LED's and reverse LED's
3" AFE Downpipe & 4" AFE Stainless Steel Exhaust, AFE Intake Manifold, AFE Momemtum HD Dry Intake
18" x 9" Ultra Predator 8 Wheels / Cooper Discoverer AT3 275/65 R18 Tires
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post #2 of 23 (permalink) Old 12-26-2012, 06:16 AM
it stinks and whistles :)
 
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I hear good things about the diamond eye.


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06 lly,
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5" straight pipe, egr blocked, cognito ucas,
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post #3 of 23 (permalink) Old 12-26-2012, 07:53 AM
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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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post #4 of 23 (permalink) Old 12-26-2012, 11:55 AM
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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.

2003 EX BORDER PATROL LB7 Duramax/allison. Completely stock except for edge cts and offroad package border patrol upgraded it with. EC/SB - sold

2007 lbz duramax lt ec/sb - bone stock
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post #5 of 23 (permalink) Old 12-26-2012, 11:56 AM
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Mine is an mbrp turbo back straight pipe and I believe it cost right at 3 hundred bucks.

2003 EX BORDER PATROL LB7 Duramax/allison. Completely stock except for edge cts and offroad package border patrol upgraded it with. EC/SB - sold

2007 lbz duramax lt ec/sb - bone stock
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post #6 of 23 (permalink) Old 12-26-2012, 12:24 PM
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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.

2012 Silverado 2500HD Z71 LTZ- PCV reroute/EGR delete/cp3k/MBRP down pipe/FloPro 5" stainless/ADII 165/PISK/CTS Insight/Fuel Lethal 20x9/295-55 Terra Grapplers

06 CCSB 4x4 rancho lift/MagnaFlow down pipe/4" MagnaFlow stainless/trans go/EFI by Rob/Edge Insight CTS/AD165/egr blocked/pcv reroute/trans lines- SOLD

05 Cummins 4x4 silver short bed/road armor/smoked cab lights/edge J/A/ISSPRO gauges/straight pipe/H2's with 35" Hankooks/a few Carli goodies/08.5 steering linkage/red head gear box. SOLD
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post #7 of 23 (permalink) Old 12-26-2012, 12:39 PM
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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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post #8 of 23 (permalink) Old 12-26-2012, 01:20 PM
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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!

2007 CHEVY 2500 HD CCSB LBZ
EGR-Blocker, PCV Re-route, Modded Airbox, DE Dual 4in Turbo back, DE 3" Downpipe, Transgo Jr, EFI-Live from Hassler Diesel, PPE race valve
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post #9 of 23 (permalink) Old 12-26-2012, 07:54 PM
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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

2004.5 lly CC/SB LT white 147k : EFI Live DSP5 Tuned by Kory : Georend transmission : Stright piped 4in MBRP turbo back exhaust : Pro fab down pipe : S&B CAI : Banks hot side intercooler pipe : EGR Block plate : AFE mouth piece : raptor lift pump : ported fuel fitting : shimmed fuel valve : CAT Nicktane adapter : Rare parts tie rods : Traction bars : Drive shaft loop
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post #10 of 23 (permalink) Old 12-27-2012, 05:42 AM
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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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5" magnaflow 3" Mbrp DP
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Built trans from Mike L. Goerend ML-R
PPE Gen 3 tie rods PPE deep pan Suncoast filter lock
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