Straight pipeing

[jamesashtoncan]

Hello ladies and gents. I have one ignorant question that sounds really stupid but here it goes. Would takeing out the muffler and cat out of my 02 duramax harm my motor in any way? And what are the benifits of cons of it?

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[joshd472]

It will not harm it. Your mpg will go up and a slight power gain.

 

[jamesashtoncan]

Awesome thanks. I cant wait to see what it would sound like when i do it.

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[WVRigrat05]

It'll sound like a shop vac.

 

[jamesashtoncan]

Ohh

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[WVRigrat05]

The LB7's don't do it quite as bad with the ihi turbo, but your def. not have a deep sound in the higher RPM's.It will make it breathe a little better though.

 

[jamesashtoncan]

Well i guess thats where the improvement on performance comes from.

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[joshd472]

I bought my lly with a muffler and cat delete. Sounds like a dang propane heater.

 

[WVRigrat05]

I ran my LLY for a year or so with stock exhaust straight piped and it sounded like a pissed off hair drier at WOT. It did wake it up and I didn't noticed fuel mileage but I always had it at the floor board.

 

[jamesashtoncan]

Thats sweet

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[joshd472]

I ran my LLY for a year or so with stock exhaust straight piped and it sounded like a pissed off hair drier at WOT. It did wake it up and I didn't noticed fuel mileage but I always had it at the floor board.

So I take it a 4" or 5" will make the tone noticeably deeper?

 

[WVRigrat05]

It helps for sure in the cruising and lower RPM, but changing the downpipe gets rid of all the screeching at higher RPM's.

Edit: I've ran a 4" exhaust with a stock down pipe and it was deeper down low, but sounded no different at WOT other than the turbo screech form the restricted down pipe was wayy louder.

 

[jamesashtoncan]

Would it possibly make my turbo sound a little bit louder?( another stupid question)

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[WVRigrat05]

It'll make the turbo noise louder out back but as far as the turbo itself being louder, no. And LB7 's rumble at idle so your only going to hear the turbo more going down the road.

 

[jamesashtoncan]

Thats exactly what i want

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[joshd472]

Appreciate it. It'd be nice if the down pipe wasn't such a pita to remove.

 

[jamesashtoncan]

I agree

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[TheBac]

Moved into Exhaust section.

 

[jamesashtoncan]

Ok thank you.

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