MBRP 4" too loud
Freshman User
Joined: Jul 2006
Posts: 32
Likes: 0
I have a 4" turbo-back installed and put the muffler in the "loud" direction. I am going to sound deaden the rear of the cab to quiet the sound down a bit on the interstate. Think there was a write-up on here somewhere about sound deadening. But love pushin thru that manual on the city streets with the windows down now and then. Only thing that was a nusiance in the beginning was the DP riding on the starter motor causing a rattle. Solved that with a bracket off the trans to standoff the exhaust. Done.
Postmaster
Joined: Nov 2003
Posts: 3,595
Likes: 0
From: Utah County, UT
I noticed a slight pitch sound change when going to 4", also, the manual stated that the proper direction of the muffler is with the louver openings facing the rear of the truck. that is how mine is, I wouldn't say it is louder in the cab though.
Laughing Gas
Joined: Jan 2006
Posts: 1,045
Likes: 5
From: Gig Em, Tx
Originally Posted by afastone
I didn't have to remove any heat shield to install. My muffler is the same design as yours, I installed it the way it was recommended in the instructions, louvres facing the flow of the gases. I assumed this would be quieter since turning it the other way would pretty much be like having a straight pipe since none of the gases can enter the louvers.
Thread Starter
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Junior User
Joined: Mar 2006
Posts: 52
Likes: 0
Originally Posted by sgrol
You have it installed incorrectly. The way you put it in will make it quieter at the outlet of the muffler but louder in the cab. Turn the muffler around and I think it will help. One more thing - mine sometimes hits a bolt on the tranny crossmember and it reverberrates through the whole truck. I have to make an adjustment from time to time to get it off the bolt. That is only noticeable when it idles though.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
Originally Posted by dmueller71
I had no problem hearing my buddies daughter rambling on for 28 hours straight.
They do talk don't they. 
You guys removed your heat sheilds???? Every one of mine remains installed on the truck and I have the 5" cannon. It's just a matter of getting it positioned correctly.
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Junior User
Joined: Mar 2006
Posts: 52
Likes: 0
Well it's official I must be getting old. I took a couple of buddies out for a drive to get ther opinions, neither one of them tought that it was much louder than the stock one. Just a deeper sound that's more noticeable at lower rpm's. I guess i'll have to learn to like it because I sure do like the difference in perfomance.
Senior User
Joined: Nov 2005
Posts: 308
Likes: 0
I'm still young at 21, so my spring break money is going into a MKO 4'' kit, and I feel that the muffler will not be in the equasion.
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Posting Guru
Joined: Sep 2004
Posts: 1,119
Likes: 0
From: Hamilton, MT
Dont forget about the sound of the "Warm-up-valve" when it kicks in on the cold days. I thought my turbo was going to shell out when I first heard it kick in
, and my neighbors probly think my truck has something wrong with it..lol
, and my neighbors probly think my truck has something wrong with it..lol
