Driving without Exhuast for 2 Days??

TurbDies2500 · 06-28-2009, 01:21 PM

I have an 03 Duramax and I am currently getting some work done to my muffler. Can I drive the truck without the exhuast cat back for a couple days without creating problems with the engine etc. I know its loud but I can deal with that. Will the lack of back pressure hurt the engine in anyway?

Please let me know. Thanks

**matt_28_01** · 06-28-2009, 01:24 PM

The only thing you will have to worry about is noise. Where does the exhause come out right now. Heat may be a small issue.

TurbDies2500 · 06-28-2009, 01:27 PM

it comes out right after the cat. I think i remeber one of my friends doing it a while back for a few days and being fine. I just wanted to see what other people thought.

**delong_1** · 06-28-2009, 01:30 PM

thats what i did with mine the day i got it after i ordered my exhaust, it wont hurt anything.

TurbDies2500 · 06-28-2009, 01:33 PM

You had a stock truck and did it with no tuning and it isnt a problem? No heat problems or anything?

**delong_1** · 06-28-2009, 01:36 PM

it kinda sucks because it turns the underside black but thats about it. it was all stock at the time, like i said i did it the day i bought the pickup.

1LoudDuramax · 06-28-2009, 01:49 PM

Quote:

Originally Posted by TurbDies2500

I have an 03 Duramax and I am currently getting some work done to my muffler. Can I drive the truck without the exhuast cat back for a couple days without creating problems with the engine etc. I know its loud but I can deal with that. Will the lack of back pressure hurt the engine in anyway?

Please let me know. Thanks

Ok i have to ask, what exactly are you getting done to the muffler? Id ditch that cat to fo sho

RedBowTies88 · 06-28-2009, 01:49 PM

yea i drove like that for a while too its fine. and its not even much louder long as the cat is still on there.

blacksmoker09 · 06-28-2009, 03:40 PM

Quote:

Originally Posted by TurbDies2500

I have an 03 Duramax and I am currently getting some work done to my muffler. Can I drive the truck without the exhuast cat back for a couple days without creating problems with the engine etc. I know its loud but I can deal with that. Will the lack of back pressure hurt the engine in anyway?

Please let me know. Thanks

I did it with mine and ran it straight behind the cab with no cat for about 2 months and it started to not start and would stall at low rpm's, so I replaced the injectors, changed the fuel filter a bunch of times, got new fuel lines, and still nothing. I had to get an inspection sticker so I had to put the muffler back on and as soon as I did it started up. The only thing I could think of was the exaust valves were staying open when I shut it off and there wasn't enough back pressure to close them? not really sure but it's fixed now.

**bigdaddydiesel** · 06-28-2009, 03:43 PM

I agree, My 03 has not had a muffler or anything like that for a while. I ran it straight piped from the start witho0ut a tuner or any other mods and was fine.