Literally just the amount of air that flows through it, might make it louder with a 5” also. No real performance gain between a 4” and 5”, just personal preference really.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.What is the big difference between the 4" and 5" besides the size.
I wont say that i was wowed by the MBRP kit i got, the instructions were lousy and did not match the parts i received.... however, it does all fit, work, and is nice and rigid once installed so i really cant complain, especially at the price point its at. I opted for a muffler on mine and dont seem to get nearly as much drone on the highway as others have commented on from a straight pipe.I am looking at the MBRP 4" exhaust for my 2001 Chevy I dont know a lot about MBRP. Are they a good company and will I get great sound out of the exhaust. It will be from the down pipe back no muffler.
Unless your producing tons of power where you have the exhaust flow to utilize the larger pipe, there is no difference besides maybe the tone. the 5" is more likely to drone on the highway also.What is the big difference between the 4" and 5" besides the size.
the mufflers that come in the kits are trash, may as well throw those in the scrap bin. I'd spend the money on either a FTE resonator or a MBRP "quiet tone" muffler. I have both a 12" FTE resonator and then the quiet tone muffler and I'm thrilled with the result after being straight piped for 5+ years. you tell yourself it doesn't drone in the cab, but holy hell the difference you notice when it's not there anymore. my LBZ still has a nice low idle and it's definitely not much quieter than the straight pipe was at idle, but off idle and under acceleration it is somewhere between stock and straight piped, with zero drone in the cab.
if you want more volume, run just a resonator, won't cut the sound down by much but the lack of drone is worth every nickel
https://www.youtube.com/watch?v=C4dUJl71P3A
yeah my truck on high idle used to be obnoxious. also a lot of VVT "noise" from the turbo off idle up to 2k rpm's, now it's got whistle and rumble with none of the "noise". not sure how to describe it any better than that but wish I did it a long time ago. This truck with michelins and the resonator/muffler setup cannot be more than a handful of decibels louder than the new pickups, I was shocked at the difference coming from a straight pipe and M/T tires, maybe I'm growing up.yea thats what i have, the quiet tone muffler. Keeps the truck reasonably quiet up to about half to 3/4 throttle which keeps me from pissing off all my neighbors when the trucks warming up in the morning and driving out of the sub division. I plan to add the resonator at some point as well, just haven't gotten around to it.
My truck had an MBRP 4" exhaust when I bought it. The muffler cracked internally and externally within 2 years. I replaced it with a Magnaflow muffler which is built of much higher quality material.the mufflers that come in the kits are trash, may as well throw those in the scrap bin. I'd spend the money on either a FTE resonator or a MBRP "quiet tone" muffler. I have both a 12" FTE resonator and then the quiet tone muffler and I'm thrilled with the result after being straight piped for 5+ years. you tell yourself it doesn't drone in the cab, but holy hell the difference you notice when it's not there anymore. my LBZ still has a nice low idle and it's definitely not much quieter than the straight pipe was at idle, but off idle and under acceleration it is somewhere between stock and straight piped, with zero drone in the cab.
if you want more volume, run just a resonator, won't cut the sound down by much but the lack of drone is worth every nickel
I put that same diamond eye exhaust on my 03 last year and I love it. I used to run stock exhaust straight piped, and it just got to be too obnoxious.There is zero drone and it sounds so much better. It is much quieter but it has more of a low end rumble instead screaming 24/7.I was so concerned about noise and drone on my 06 LBZ so I bought the cheapest thing I could find and threw it on just to try. It has a resonator up front and a muffler in the back and I absolutely love it. Has a little rumble and absolutely no drone...
DIAMOND EYE 4" EXHAUST 01-07 CHEVY GM DURAMAX 6.6L DIESEL QUIET TONE TURBO BACK
I think it is the same low grade stuff (crap?), just a different name. Next to the tune. this is the best mod I have done to my truck so far.