Straight pipe questions....

[Scooter_092196]

So I have my LLY with a front pipe off an LB7 to delete the cat. Still running the muffler. I've been interested in straight piping it. Does anyone know of someone that sells a muffler delete pipe? Mine has an offset muffler. I stopped by a local diesel shop and they tried telling me if I straight pipe it, it will be so unbearable driving that I will want to switch back. Anyone have any input?

Thanks,

 

[Cougar281]

Mine's been straight piped for a while now. IMO, it's not unbearably loud, even when towing. I've got 4" MBRP from downpipe back, and got the muffler delete pipe when I got the "cat back" portion. Not sure what to suggest to you for removing the muffler on the stock exahust though.

 

[NemesisDP]

It will flow alot better straight piped or throw a 3 1/2" high flow muffler in. 4'' turbo back kits ain't that bad of price for the cheeper kits.

 

[JoshH]

Your local diesel shop probably told you it would be unbearably loud because they're used to Dodges. My truck has had a 5" straight pipe for over 2 years now. I really don't even notice the exhaust inside the cab.

 

[LarryJewell]

Your local diesel shop probably told you it would be unbearably loud because they're used to Dodges. My truck has had a 5" straight pipe for over 2 years now. I really don't even notice the exhaust inside the cab.

mine either, I have the 5" MBRP, no cat or muffler and also have the Diamond Eye turbo pipe as well, the noise is not bad at all.

 

[McRat]

What? Speak up. I can't hear you.

Seriously find a local guy who is straight piped and check it out.
It's not loud.

 

[Skyhigh4by]

I agree about thinking it would sound like a dodge. Those things are stupid loud with straight pipe. I bet on most duramax forums you will find there are more straight pipes out there than people running mufflers. I have a 4" straight through muffler and its pretty darn quiet, about as loud as a stock exhaust cummins.

 

[Righteyeblind]

Its noy really loud as long as you run it the full length of the truck

 

[messejme]

when I get into it it gets loud (ever been to a monster truck show) but at lower throttle they are perty quiet. Of course yours wont be as loud as mine since mine comes through the bed STRAIGHT IS GREAT!!!!!

 

[Turbo Buick 6]

LLYs, LBZs, and LLMs aren't very loud even if you open the vanes at idle. It's not untill you put a larger aftermarket turbo on them that they get louder. On my 5" MBRP I couldn't even tell a difference inside the cab with or without a muffler:baby: