Chevy and GMC Duramax Diesel Forum - View Single Post - MBRP Exhaust
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post #5 of (permalink) Old 12-03-2019, 10:46 AM
Former GM Tech and parts
DMAXfirefighter's Avatar
Join Date: Jan 2009
Location: West-Central Indiana
Posts: 2,453
Originally Posted by Herk537 View Post
What is the big difference between the 4" and 5" besides the size.
4in versus 5in has no difference in performance at all that you are going to see. They will sound different, but not noticeably that I have really found on an LB7. On an LBZ, yes, it has a noticeable difference (at least on my trucks) on 4in versus 5in.

Name: Matt
ASE Certified, former GM Parts guy
John Deere Service Manager

Play Truck - 2002 LB7 2500HD Crew Cab Short Bed
Daily/Tow Rig - 2006 LLZ 2500HD Crew Cab Short Bed

SOLD - 2007 LBZ 2500HD Standard Cab Long Bed
SOLD - 2006 LBZ 2500HD Crew Cab Short Bed
SOLD - 2004 LLY 2500HD Crew Cab Long Bed
TRADED - 2002 2500HD Crew Cab Long Bed
SOLD - 2001 2500HD Ext. Cab Long Bed
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