bowtieguy72

iTrader: (9)

I am getting close to putting the 408 in my truck. I just ordered the speed engineering 1 7/8" headers and am going to build my own 3" to 4" y-pipe with a 4" mbrp exhaust for a duramax truck. Just wondering if anybody has done something similar to this and how it sounds and performs.

GMCtrk

iTrader: (27)

I have the 4" MBRP duramax exhaust on mine.

The muffler that came with the kit was 15" long and hardly did anything for sound reduction. It was almost as loud as with open downpipe. I replaced it with a Magnaflow diesel muffler.

Otherwise, the quality of the kit was very good, bolt on.

GREENMILE

iTrader: (8)

i am.

bowtieguy72

iTrader: (9)

Do yall have any videos of what they sound like?

bowtieguy72

iTrader: (9)

Sounds good! I found a video in your build thread.

GREENMILE

iTrader: (8)

If u choose to do it. I would run a duramax tail cause i had it dumped n it was too loud. Bout 2x louder than it is now. But i love how it sounds with the tail pipe.

iamkeniff

iTrader: (16)

I run a stock duramax muffler and tail pipe.

jakenm

Just installed my 4" mbrp exhaust. Bought it from http://4wheelonline.com/MBRP_Exhausts.97283. So far, I like it. Loud yet not raspy. Everyone can hear me coming down the road. My buddy has the 5" and it sound deeper than mine.

Dorian2k7

I had the MBRP. It was what came on my 07 Z when I bought her from private seller.... The collector ended up failing where the pipe goes into the cannister and made an aweful cricket screech..... I removed and replaced with the no fail, reputable, comparable in sound 2-chamber flowmaster muffler.... Love that sound, with a lower interior drone than MB-R-POOP..... (just my experience)
Good ole Flowmaster has "NEVE LET ME DOWN".....

lxcoupe

iTrader: (9)

Ken did you have to mod the duramax tailpipe at all to get it to fit?