Aftermarket Downpipe LB7 - Chevy and GMC Duramax Diesel Forum
Aftermarket Mods. Discuss what Mods are right for you.

DuramaxForum.com is the premier Chevy and GMC Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 08-14-2012, 11:10 AM   eBay Motors  #1 (permalink)
You didn't build that...
Supporting Member
 
Duramaxn's Avatar
 
Join Date: Apr 2011
Location: Baker, OR.
Posts: 63
Aftermarket Downpipe LB7

I have been reading up on how to install an aftermarket downpipe on an LB7. Sounds like one of the biggest pains in the rear, so naturally I bought one and am hoping to get it into the shop this weekend.

Ill let you know how the install goes, as well as the performance gains/sound.

Sorry to bugger up the results about the downpipe, but I will be going from stock exhaust and downpipe to MBRP downpipe and 5" straight pipe.

Things I picked up on this forum: Remove the heat-shield, Use a torch and heat the downpipe bolts to break the suckers loose, be patient. Did I miss anything?

Cheers
__________________
2002 Chevy 2500HD ECSB 4x4

4" Lift
315 x R16 Toyo MTs on Ultra Wheels
ISSPRO Boost/Pyro
MBRP 5" Straight Pipe with 3" DP
68k miles
EFI by Rob Coddens
Duramaxn is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 08-14-2012, 11:13 AM   eBay Motors  #2 (permalink)
DuramaxForum Enthusiast
 
Thebiggids's Avatar
 
Join Date: Jun 2011
Location: Bellingham, Wa
Posts: 4,345
Dont catch your firewall insulation on fire!!! Ask me how that goes lol make sure you have a fire extinguisher close by ready to go! Goodluck, it sucks...
__________________
Gideon
01 LB7 EC/SB Ally 4x4 shop ornament
DD: 1990 4runner completely stock 4x4 3.slow


Big Thanks To Adrenaline Truck Performance, Alligator Diesel PerformanceSocal Diesel and Lincoln Diesel Specialties
Thebiggids is offline   Reply With Quote Quick reply to this message
Old 08-14-2012, 11:14 AM   eBay Motors  #3 (permalink)
Hang it!...Fire!
Lifetime Supporting Member
 
TDIpowered's Avatar
 
Join Date: Aug 2009
Location: Tacoma, Washington
Posts: 4,248
pb blaster!!
__________________
Max - 07 LBZ ECLB LOWERED!
Plugged, Rerouted, Blocked, PPE Mod, DE 5 inch, DE 3inch DP, EFI Live DSP-5 by IDAHO ROB, Insight, Raptor 150,
Transgo Jr, Nicktane, PROEFX Steel Roll Pan, XD Revolvers -24 Offset 20x10 w/ 305/50 Nitto 420s, Alligator Sleeves,
Belltech 3inch drop shackles, T Bar bolts all the way out, DDM Tuning 6000k Low/3000k Fog, and about 50lbs of Zipties
TDIpowered is offline   Reply With Quote Quick reply to this message
Old 08-17-2012, 10:34 AM   eBay Motors  #4 (permalink)
You didn't build that...
Supporting Member
 
Duramaxn's Avatar
 
Join Date: Apr 2011
Location: Baker, OR.
Posts: 63
Update:

Ok, So last night I installed my MBRP 5" straight pipe with 4" front pipe. It sounds amazing!!! I still have the stock downpipe on. I went from stock exhaust, stock muffler, and no cat to this 5" system.

EGT about 150* - 200* degree lower on highway, idles about 50* lower.

Gained 2 LBS of boost. Went from about 19 max boost to about 21 max boost.

Spools up way faster and sounds like a jet engine at WOT haha

Gained quite a bit quicker throttle response in the low end, such as starting from a stop. just barely noticed it in the top end, but it was there.

Noise is incredible! Not loud enough to get you pulled over, but still very deep, throaty, and just plain MEAN!

Best part: Almost every bit as quiet inside the cab (as long as you have the windows rolled up) You notice it, but the engine noise is still louder than the drone

Tonight will be the DPs turn!
__________________
2002 Chevy 2500HD ECSB 4x4

4" Lift
315 x R16 Toyo MTs on Ultra Wheels
ISSPRO Boost/Pyro
MBRP 5" Straight Pipe with 3" DP
68k miles
EFI by Rob Coddens
Duramaxn is offline   Reply With Quote Quick reply to this message
Old 08-17-2012, 10:38 AM   eBay Motors  #5 (permalink)
DuramaxForum Enthusiast
 
sparepartsracing's Avatar
 
Join Date: Aug 2009
Location: long island, ny
Posts: 3,653
I didnt use any head to get mine off. Just made some specials tools and they came out. The hardest part was getting to them perfectly
__________________
Truck: 2004 eclb lb7
Motor: lbz rods, delipped lb7 pistons, arp main and head studs, federal heads, lml manifold, ppe dampner.
Trans: Bt diesel works built trans, ml converter, Bt tapshift
Fuel: 60% injectors, lbz cp3
Air: s476 over stocker
Exhaust: 5" downpipe, 5" exhaust factory exit no tip. Bd manifold. Everything heat wrapped.
Wheels: 20x10 fuel hostages, 35" nitto trail grapplers
Bumpers: roll pan, big Chevy hitch
sparepartsracing is offline   Reply With Quote Quick reply to this message
Old 08-17-2012, 10:42 AM   eBay Motors  #6 (permalink)
You didn't build that...
Supporting Member
 
Duramaxn's Avatar
 
Join Date: Apr 2011
Location: Baker, OR.
Posts: 63
OAh, Also! I have a question for all you MBRP users.

How on earth do you stop the tiny exhaust leaks around the connecting points that connect against the flow of the exhaust...that's just a plain flawed design anyhow...

I'm getting a bit of flow out of the cuts which are placed in the flanges, even though the pipe is shoved in ALL the way, and clamped down. I don't really want to weld it in case I need to take it off for some reason.

BTW: my spare tire fits fine. no problems.
__________________
2002 Chevy 2500HD ECSB 4x4

4" Lift
315 x R16 Toyo MTs on Ultra Wheels
ISSPRO Boost/Pyro
MBRP 5" Straight Pipe with 3" DP
68k miles
EFI by Rob Coddens
Duramaxn is offline   Reply With Quote Quick reply to this message
Old 08-17-2012, 11:36 PM   eBay Motors  #7 (permalink)
You didn't build that...
Supporting Member
 
Duramaxn's Avatar
 
Join Date: Apr 2011
Location: Baker, OR.
Posts: 63
Alright, I installed my MBRP Downpipe tonight with the help of my brother-in-law. Just got done. WOW was it a pain in the rear!! Better plan on having at least a half of a day, from pulling into the shop until the test drive.

Honestly, I am not sure what I think about it. It increases the drone of the 5" strait pipe considerably. Man is my exhaust is loud now. I noticed quite a bit less back pressure. The engine does not act as my brake very well anymore.

I can tell that the upgrade gave it a deeper sound, and the turbo is a bit more noticeable. Boost stayed the same as it was with the stock DP and 5" strait pipe, maybe quicker spool-up..I can't really tell. I feel as though it has more get up and go however.

Make sure to say a prayer before you try to take the stock DP off because they are hard to get to and require patience. Not impossible by any means. Just take your time and be prepared to spend about 20 minutes per bolt trying to figure out how to get enough leverage to break it loose.

I wrapped my DP with heat wrap just in case.

All in all, it was a simple installation, just time consuming.
__________________
2002 Chevy 2500HD ECSB 4x4

4" Lift
315 x R16 Toyo MTs on Ultra Wheels
ISSPRO Boost/Pyro
MBRP 5" Straight Pipe with 3" DP
68k miles
EFI by Rob Coddens
Duramaxn is offline   Reply With Quote Quick reply to this message
Old 08-18-2012, 05:29 PM   eBay Motors  #8 (permalink)
 
Join Date: Jun 2010
Posts: 3
Awesome Thread, definitely convinced me to go the MBRP Route.
ThePro is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply


Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Chevy and GMC Duramax Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 12:31 PM.



Powered by vBulletin® Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Friendly URLs by vBSEO 3.6.1