straight pipe or BTM
Locomotive breath
Joined: Jan 2006
Posts: 1,354
Likes: 1
From: Mid Oh. Ponderosa
I had a 4" straight exhaust on the '99 for 2 years, it sounded good until you climbed hills then the drone was extreme. I put a BTM on it 2 years ago and it helped alot with out quieting the turbo-whistle to much.
Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
Before I installed my 4" system, I had a BTM on the stock system, and also ran a straight pipe for a short while. The BTM made a fairly big difference in sound over the stock muffler. Nice rumble off the line and I could hear the turbo spool up. At highway speeds, it wasn't much different than stock. When I took it off and ran the stock system straight piped, it was a bit louder over all. Plus, I got a bit of a drone at highway speeds. Sounded pretty good though.
Either way, I can't say for sure if I had any performance or mpg gains though. It seemed like it the pedal was more responsive. Since I didn't have my gauges in yet, I don't know the effect it had on the EGT. But judging by the look of the completely restrictive stock muffler, it had to drop by a decent amount.
Once I installed the 4" MBRP system though, the power and mpg gains were noticeable. Small, but noticeable. I have the system with their muffler and it has a nice rumble to it with a very audible turbo whistle. With the muffler it is very reasonable at highway speeds.
Either way, I can't say for sure if I had any performance or mpg gains though. It seemed like it the pedal was more responsive. Since I didn't have my gauges in yet, I don't know the effect it had on the EGT. But judging by the look of the completely restrictive stock muffler, it had to drop by a decent amount.
Once I installed the 4" MBRP system though, the power and mpg gains were noticeable. Small, but noticeable. I have the system with their muffler and it has a nice rumble to it with a very audible turbo whistle. With the muffler it is very reasonable at highway speeds.
Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
My truck had a magnaflow straight threw muffler on it with stock pipe infront of that (no cat) with a 45* where it came out infront of the rear tire, it sounded good I liked it.
I put a 4'' turbo back on it and WOW I knew a difference right away. Ill admit that it sounds like s*** any time other than when Im on it hard! It sounds awesome!! Good enough that Ill leave a muffler off lol, turbo whistle is just a nice
If I were towing it would get old fast
I have noisy big wide tires and a loud exhaust, the way I look at it is I can hear my hard earned money working the way it should.
My opinion may not be relivant because I changed out the down pipe and all with 4'' but I thought maybe someone might want to hear my opinion.
Living in California dont you have strict regulations about not running a muffler?
I put a 4'' turbo back on it and WOW I knew a difference right away. Ill admit that it sounds like s*** any time other than when Im on it hard! It sounds awesome!! Good enough that Ill leave a muffler off lol, turbo whistle is just a nice
If I were towing it would get old fast
I have noisy big wide tires and a loud exhaust, the way I look at it is I can hear my hard earned money working the way it should.
My opinion may not be relivant because I changed out the down pipe and all with 4'' but I thought maybe someone might want to hear my opinion.
Living in California dont you have strict regulations about not running a muffler?
Lead Driver
Joined: Jul 2011
Posts: 8,679
Likes: 191
From: On the Edge of the Desert
got a 3.5" stright pipe on mine. a few weeks ago i was towing 11,000lbs and hauling 2,000. combined 24,000lbs. when i was getting on the interstate, there was a car that was going to pass me on the ramp, i had it floored and they musta got scared once they heard the truck making so much god d*** noise. they were even on the left side, my exhaust is on the right.
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Lead Driver
Joined: Sep 2010
Posts: 7,793
Likes: 50
Not sure what i was after, asking the question. More or less, if the $75.00 investment would be good/benefit, over the straight pipe. Considering though, come next July when truck needs smogged, i probably should have something there where the stock muffler, used to be.
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Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
I've had mine straight piped for 4 years now and will be getting something to cut down the noise soon. Its gotten to the point where I'm tired of the noise and I'm sure the neighbors are too, especially when I come up the hill to my place! My brother just put a resonator on his 5.9 and it quieted down a bit, but didn't do anything to the power, so thats probably what I'm gonna try. They're around 80 at Napa and are straight through like a glass pack.
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Hotshot
Joined: Jan 2008
Posts: 13,144
Likes: 11
From: Rochdale MA
Not sure what i was after, asking the question. More or less, if the $75.00 investment would be good/benefit, over the straight pipe. Considering though, come next July when truck needs smogged, i probably should have something there where the stock muffler, used to be.
Posting Guru
Joined: Dec 2010
Posts: 1,153
Likes: 0
From: Boston, MA
Now lift and tints they do care about.....truck doesn't see much action any more now that I have the TDI Jetta.
Posting Guru
Joined: Feb 2010
Posts: 1,411
Likes: 1
From: Opelika, AL
i am happy with my BTM. 3.5" (stock) and BTM seems good to me. opens it up a little more without being a disturbance to anyone else.
The do make a 4" version of the BTM....if you plan to go to 4"
I got mine off Amazon
http://www.amazon.com/Walker-Exhaust...6701883&sr=8-1
The do make a 4" version of the BTM....if you plan to go to 4"
I got mine off Amazon
http://www.amazon.com/Walker-Exhaust...6701883&sr=8-1
Posting Guru
Joined: Dec 2007
Posts: 1,377
Likes: 3
From: Oklahoma
The only problem I have with mine is that for no more use than it has, it is rattling on the inside. VERY ANNOYING! I kind of wish I would have straight piped it and tried that first, but in your case you probably need something on there. It sure did sound good until something came loose. I remember posting up right after getting it and talking about how great it was to hear the truck with the windows down and driving by a wall on the interstate.
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