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Duramax03 08-10-2008 08:05 PM

Best Exhaust?
 
i have LB7 duramax... and i was looking at a 4in turbo back MBRP installer series exhaust system..
would this be a good choice?

2500HeavyDuty 08-10-2008 08:06 PM

just about any 4 inch would be best. I didnt have a problem with the MBRP when installing it.

What size cab/bed is your truck

Duramax03 08-10-2008 08:44 PM

i have a ext cab short box.
and when i looked on the mbrp website it said its a "down pipe back" system?? is that good

Oilfield_Mafia 08-10-2008 08:54 PM

x2 on the MBRP.. I have one on my LBZ, and I love it.. awesome quality, and it was easier to put the new exhaust in that it was to take the old one off.. I would reccommend the MBRP, but I dont have any expierence with any other exhausts, so there may be a better system..

2500HeavyDuty 08-10-2008 09:00 PM

Its a down pipe back system (referred to turbo back by most people) because there is only one company that i know of that makes a replacement down pipe but its huge and its really only for if your making well over 500hp at the wheels.

The downpipe back system replaces the whole system up the to turbo downpipe right at the flange.

The lly's and lbz's have a down pipe replacement made by diamond eye but they don't make them for lb7's. It is not necessarily needed the system you are looking at is good.

Since u have an extended cab and lookin at a mbrp system, u will have to cut nine inches off of one pipe since it was made for a crew cab. And you would have a 18 inch pipe laying around since it would be for if you were to have a long bed. atleast that was the wait it was for my 5 inch exhaust from MBRP:humm:

TCU Fan 08-10-2008 09:07 PM

3 Attachment(s)
I had the MBRP duals and loved them. I also had the magna flow "flow pro" it was a nice system also but man was it loud. I ended up putting a 24" muffler on it to tone it down before I took it out for the MBRP.

If I were you, I would take it somewhere and have the tip welded on, get the tip that does not bolt on, rather welds on.

This is my LLY but I had the same set up on my LB7 and it looked exact.

Attachment 56732

Here is the MBRP and the Pro Flow on top and another picture of the welded MBRP on bottom.

Attachment 56733
Attachment 56734

Oilfield_Mafia 08-10-2008 09:11 PM


Originally Posted by 2500HeavyDuty (Post 192957)
Its a down pipe back system (referred to turbo back by most people) because there is only one company that i know of that makes a replacement down pipe but its huge and its really only for if your making well over 500hp at the wheels.

The downpipe back system replaces the whole system up the to turbo downpipe right at the flange.

The lly's and lbz's have a down pipe replacement made by diamond eye but they don't make them for lb7's. It is not necessarily needed the system you are looking at is good.

Since u have an extended cab and lookin at a mbrp system, u will have to cut nine inches off of one pipe since it was made for a crew cab. And you would have a 18 inch pipe laying around since it would be for if you were to have a long bed. atleast that was the wait it was for my 5 inch exhaust from MBRP:humm:


My 4" MBRP system had a piece in it for EC and another piece for CC.. so with the system that I got, you wouldnt have to cut anything..:U:

2500HeavyDuty 08-10-2008 09:14 PM

Thats good to know, i guess they don't have much options when it come to a 5 inch exhaust

dgoossen 10-27-2008 11:30 PM

MBRP does make a down-pipe kit for an extended cab short box. No cutting required just bolt it on. Magnaflow does not however, theirs is only for a crew cab short box. With Magnaflow you will need to take 8 or 9" off. You might also have a problem with the spare tire being close to the exhaust...

tomc983 11-04-2008 07:12 PM

i just bought a 4in mbrp my self and it was very easy to install i would recomend tryin to find someone to help hold it other then that sounds great

SnoMan 05-03-2009 03:44 PM

what is better the 4in or the 5 in performance wise??? Thanks

uwyo_dmax 05-03-2009 04:18 PM

theres really no performance difference because even a 5" system will have a 4" downpipe. It mostly just comes down yo your preference, and the cool factor.

SnoMan 05-03-2009 08:28 PM

Since there is no performance advantages Which one do you guys think sounds better??? 4 or 5in.???:c:

KuNtRy BoY 05-03-2009 08:58 PM

Igot a 4in down pipe into 5in into 6in stacks sounds awesome.:U:

uwyo_dmax 05-03-2009 09:15 PM

5 inch dude :U:

chevyburnout1 05-04-2009 06:35 PM

Can't beat the sound of 5". Not sayin 4" sounds like crap but its amazing what an inch will do ;)

I've messed around with my exhaust, from running no muffler all the way to running it straight out the up-pipes. I think the longer and bigger the exhaust can be the deeper and more badass they sound.

SnoMan 05-06-2009 12:56 PM

Is the 5 in ungodley loud taking it easy on the peddle, or is it queit taking it easy?

I hear the 4in is quiet taking it easy and has alittle bark when you peg it. What do you guys think?

Diesel Dawgs Performance 05-06-2009 04:22 PM

Depends on if you get a Kit with a Muffler

chevyburnout1 05-06-2009 06:17 PM

Mine's well within reason just fartin around town. However I'm not outside or behind it while I'm driving. Getting on it and you know your loud, regardless :rocking:

I did forget to mention mine is straight-piped. You can get a flow through muffler with both 4 and 5 inch. Exhaust is a guessing game sometimes.

uwyo_dmax 05-06-2009 06:49 PM


Originally Posted by chevyburnout1 (Post 334446)
Mine's well within reason just fartin around town. However I'm not outside or behind it while I'm driving. Getting on it and you know your loud, regardless :rocking:

I was and its loud! :U:

chevyburnout1 05-08-2009 12:36 PM

As was yours :5:

dirtymax88 06-25-2009 02:48 PM

the banks monster is nice. just a little quiet for my taste

Seadrivejoe 07-10-2009 06:56 PM

I have 4" turbo back Magnaflo with a 5" tip. You dont want it any louder. I did notice a slight drop in MPG. Am told that combined with cold air intake that is to be expected. Any thoughts? Have now added Hypertech stage 3 so will see,

gotstreetracin 10-20-2009 09:51 PM

i have a 4" "turbo back" cut up into 5" silverline stacks and i love it the only thing that sucks is the mounting provisions have to find somewhere that has 5" straps to mount in bed system....i love my stacks i can talk on the phone while driving normally now it was straight piped infront of tires that sucked!!!

2500HeavyDuty 10-21-2009 04:13 PM

you shouldnt be talkin on the phone and driving anyway :tttt:

chevyburnout1 10-21-2009 06:03 PM

.... or eating taco bell, shifting a manual, messing with your IPOD, texting..... Of course I don't do that :w2:

gotstreetracin 10-21-2009 07:50 PM

yea yea know.....:w2:


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