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| 06-07.5 LBZ & LLY Performance Parts Discussion Discussion of Performance Parts For the 06-07.5 LBZ/LLY Duramax Trucks No Advertising |
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06-10-2008, 10:50 AM
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eBay Motors
#1 (permalink)
| | Junior Member
Join Date: Feb 2007 Location: Pennsylvania
Posts: 8
|  Screeching sound at about 3500 rpms
I have a 2007 Classic HD lbz and have MBRP 4" cat-back exhaust, PPE xcellerator running program 3, Banks Ram-air intake, blocked resonator, and just got finished installing a MBRP Front pipe.
Here's the deal... The truck starts, idles, and runs great until about 3500 rpm's and it starts to screach loudly from the exhaust. It will only make this horrid sound under a load. If I am out in the open where the sound cannot bounce back I don't hear it, but against a barrier it's pretty loud.
This isn't normal is it? Anyone see this before? Ideas? | 
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06-10-2008, 10:53 AM
|
eBay Motors
#2 (permalink)
| | DPF Delete man
Join Date: Mar 2008 Location: Columbus,IN
Posts: 3,079
| that sounds like you are just experiencing how these trucks sound. They get real loud and dont sound must like a diesel
__________________ 07.5 Chevy Summit White Reg cab LMM, Quadzilla steath 2, 5" MBRP straight pipe, 5" turn-down DPF Deleted, Cobalt boost & pyrometer, line of fire and ice. 5% tint. Banks Ram air intake. Meyer Performance & Fabrication, LLC Home of your diesel performance needs. www.meyerperformance.com (812)-344-4421 Tyler | 
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06-10-2008, 10:53 AM
|
eBay Motors
#3 (permalink)
| | Junior Member
Join Date: Feb 2007 Location: Pennsylvania
Posts: 8
| I must add that the noise JUST started after installing the Front pipe. | |
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06-10-2008, 11:00 AM
|
eBay Motors
#4 (permalink)
| | DuramaxForum Veteran
Join Date: Dec 2007 Location: San Mateo, CA
Posts: 836
| The Cat is basicly a muffler. My truck got way louder after putting the front pipe on. My truck sounds like a cat getting RAPPED when I am in the throttle hard.
__________________ John
05 4 door short bed 4x4 chevy LLY
EFI LIVE with McRat tune, DPS5, PPE Lift Pump, 4inch Turbo Back Strait Piped MBRP Duals, EGR block off, AFE stage 2 intake, Turbo resonator blocked off, 6000k HID kit, 305/75/16Super Swampers on stock rims, Auto Meter boost and pyro gauges, Killer sound system, Limo tint all the way around, Suncoast Stage IV built by me.  NO TALKING JUST LINE IT UP | |
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06-10-2008, 11:06 AM
|
eBay Motors
#5 (permalink)
| | Junior Member
Join Date: Feb 2007 Location: Pennsylvania
Posts: 8
| haha... alright cool thanks guys. | |
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06-10-2008, 11:16 AM
|
eBay Motors
#6 (permalink)
| | DPF Delete man
Join Date: Mar 2008 Location: Columbus,IN
Posts: 3,079
| ya i think its the best sound out it scares people
__________________ 07.5 Chevy Summit White Reg cab LMM, Quadzilla steath 2, 5" MBRP straight pipe, 5" turn-down DPF Deleted, Cobalt boost & pyrometer, line of fire and ice. 5% tint. Banks Ram air intake. Meyer Performance & Fabrication, LLC Home of your diesel performance needs. www.meyerperformance.com (812)-344-4421 Tyler | |
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06-10-2008, 11:42 AM
|
eBay Motors
#7 (permalink)
| | BRAIN SURGEON !!!haha
Join Date: Mar 2008 Location: Louisiana,when they let me stay
Posts: 2,087
|
__________________  There she is<<
2006 GMC 2500HD4x4 sb cc LBZ!!!  52k
MODS/Full straight pipe,res mod,SC Fpaq tuner,285/75/16's
Additional gray Berber carpet on floorboards/courtesy of a customer whose home we just built!!!!FREE
2002 GMC 1500 2wd x-cab-sb 5.3l.
1987 89,000k 305H.O. 700-r4[pearl white/red striped]
1978 Malibu[2dr]350c.i./350hp TH-350 trans/jus a lil quick!!!
WORK RIG 2007 YukonXL GPS monitored  for speed,braking,accel,and 5 mile radius from home..oh well  | |
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06-10-2008, 12:18 PM
|
eBay Motors
#8 (permalink)
| | Duramax Forum Supporter
Join Date: Mar 2008 Location: Iowa City, Iowa
Posts: 112
| Quote:
Originally Posted by Meyerperformance@tls.net  ya i think its the best sound out it scares people | I second that! I love seeing people jump on sidewalks or old ladys screaming at me because the pipe was right in their buicks window!! 
And the F-16 reference is such a good compliment from people!
__________________ 2004.5 GMC 2500HD -9 DZL NV- Hog 4" SS Turboback w/6" SS Polished Tip, AFE Stage II Intake, EGR Block and Finger Stick, Resonator Plugged, PPE Fuel Release Valve Shim Kit, TTS Dual Lift Pumps, Quadzilla Stealth2
Pioneer In Dash DVD, CD, MP3, and NAV, Boston S60 Internals all around, 10" JL W3 Sub, JL 500/1 Amp, Custom Under-Seat Non-Ported Box, Triple Pillar w/Autometer Sport Comp II (EGT, Oil Temp, BOOST), 15% Tint Up Front
285's BFG A/T, ArmorThane Spray-in Bedliner, Extang R/T Tonneau Cover, Black Step Tubes, Allison 5500 Badges, Recon LED Big Rig Kit, Red Varad Expansion LEDs, Recon LED Smoked Cab Lights, Black LED Third Brake Light, LED Line of Fire Under Tailgate | |
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06-10-2008, 02:04 PM
|
eBay Motors
#9 (permalink)
| | Junior Member
Join Date: Feb 2007 Location: Pennsylvania
Posts: 8
| Starting to get used to the new sound... It's great! plus the truck really rips now.
Tranny mods... coming soon
__________________ 2007 Classic 2500HD LBZ Crew, Leather, Sunroof, DVD, LT3 Mods: MBRP 4" Monster Exhaust w/ 4" Front Pipe Banks Ram Air Intake PPE Xcellerator (running lvl 3) Blocked off Turbo Resonator Coming Soon!: 2 Guage pillar w/ Boost & Pyrometer EGR Block plate and Finger Stick  | |
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06-10-2008, 02:11 PM
|
eBay Motors
#10 (permalink)
| | DuramaxForum Veteran
Join Date: Dec 2007 Location: San Mateo, CA
Posts: 836
| I see you say you are getting the EGR blocker and finger plate. With the PPE you do not need a finger stick just so you know. Get the EGR blocker as soon as possible and do the PVC reroute ASAP. If you have any questions please feel free to ask.
__________________ John
05 4 door short bed 4x4 chevy LLY
EFI LIVE with McRat tune, DPS5, PPE Lift Pump, 4inch Turbo Back Strait Piped MBRP Duals, EGR block off, AFE stage 2 intake, Turbo resonator blocked off, 6000k HID kit, 305/75/16Super Swampers on stock rims, Auto Meter boost and pyro gauges, Killer sound system, Limo tint all the way around, Suncoast Stage IV built by me. NO TALKING JUST LINE IT UP | |
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