Loud truck...

[gary_lucas]

When I bought my truck it had a dual exhaust from MBRP already installed.

This thing is loud at highway speeds, there's no muffler in there at all. There does seem to be a catalytic converter.

Ideally I'd like to return it to stock, but if there's a cheaper way to get it to be quiet I'd be open to that.

Any thoughts?

I'm checking out the local wrecking yard to see what I can get there.

Looks like I've got one of these, but not sure which.

http://mbrpautomotive.com/index.php?page=products&make=Chevy%2FGMC&model=Duramax+2500%2F3500&year=2004&cat=Exhaust+Cool+Duals

G

[CoyleJR]

Gary, I see people selling their stock exhaust systems all of the time on Craigslist. Often for $100 to $200 complete front to rear. You could also list your system on Craigslist and look for someone that wants to trade their stock system for your modified system. Additionally, you could look for a 2006 LBZ air filter assembly. People put on aftermarket air filters and take whatever they can get for the original air filter. If you look under Duramax parts you won't believe what you will find for sale.
I am glad you found the overheating problem on your truck.

Good luck
John

[a5150nut]

My 06 has same system but with the muffler in it. I get just a slight drone pulling heavy at 65/70 but nothing I can't live with. You might just get the muffler and add it.

[gary_lucas]

My 06 has same system but with the muffler in it. I get just a slight drone pulling heavy at 65/70 but nothing I can't live with. You might just get the muffler and add it.

I would totally do that.

So did you buy it as a kit or buy a muffler and weld it in yourself?

If so which muffler?

G

[gary_lucas]

a5150nut

I had a closer look at the kit on the web page.

I see that it actually comes with a muffler (admittedly, a very small one), I loaned the truck to my father and when I get it back I'll take another look and see what's on my truck. It seems insanely loud. With the windows down it's pretty loud... At highway speed the cabin ambient noise is quite a bit louder than my friends stock truck.

[a5150nut]

Mine was on the truck when I bought it. I was thinking about removing the muffler but after crossing this country a few time In it, I'll leave her alone.:rolleyes:

[More Power]

Just install a larger muffler. Any of the 4" aftermarket mufflers should fit. If quiet is your goal, the Banks systems are the quietest I've heard, but most should do well. The size of the muffler is an indicator of how quiet it might be. Just explain to the person on the phone that quiet is your goal.

For a stock airbox, locate one of the larger auto recycling centers near you. They'll have an online presense, and you can order online or over the phone. That's how I bought a string of stock parts for my Lil Red project some years ago.

[Kennedy]

Try the muffler, but in my experience I can "feel" the duals even the Banks at startup. There is just that much more pipe back there to resonate.

Length and diameter (volume) are keys to muffler sound reduction. MBRP historically has the lowest volume and a louder sound as they typically use a 6" diameter pipe as the shell where others use more in the 9" range.

[gary_lucas]

Had a busy couple of weeks, finally remembered to look under there.

There's definitely no muffler, I think they replaced it with this piece:

http://mbrpautomotive.com/index.php?page=products&part=MDDAL27

So should be pretty straightforward to replace with anything off the shelf.

Doesn't look like MBRP sells the dual exhaust muffler which I assume would be a direct drop in replacement... So need to do some cutting I presume.

Thanks all, I'll be needing to do a little research...

G

[gary_lucas]

Try the muffler, but in my experience I can "feel" the duals even the Banks at startup. There is just that much more pipe back there to resonate.

Length and diameter (volume) are keys to muffler sound reduction. MBRP historically has the lowest volume and a louder sound as they typically use a 6" diameter pipe as the shell where others use more in the 9" range.

"Lowest volume and loudest sound" had me confused for a moment :)

It doesn't need to be super quiet, I think any muffler on there will probably solve my problem :)

G

[gary_lucas]

So I found a decent 4" magnaflow.

It's a little quieter, maybe 50%, I wasn't particularly happy with it at first... But after taking the trailer down to Deception Pass I was pretty happy with the overall result... Still not nearly as quiet as stock...

Mileage seems to be slightly higher, but that could be me driving like an ******* too.

One O' these days I will track down a fully stock exhaust system and just replace all the stuff the original owner did. My friends truck runs so much quieter.

---
PS, unrelated... But the wife has been driving the truck... 3 years, not a scratch... 2nd day... Wife turns too tight into the pillar in OUR parking spot... Ugh... :'(

[a5150nut]

---
PS, unrelated... But the wife has been driving the truck... 3 years, not a scratch... 2nd day... Wife turns too tight into the pillar in OUR parking spot... Ugh... :'(

When my wife is going to drive my K3500 I always reminder her it has wide hips.

[gary_lucas]

When my wife is going to drive my K3500 I always reminder her it has wide hips.

I do that too... But she didn't listen, she was more concerned about dinging the commuter car so she turned left into the pillar.

I sanded it down, and painted it with the stock GM black... There's still a dent but at least it shouldn't rust.