Lb7 downpipe - Diesel Bombers



Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Old 06-01-2011, 08:46 PM
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Default Lb7 downpipe

I have an 02 duramax with a mbrp 4" turboback exhaust. Im thinking about adding a 3" turbo downpipe. Are the gains worth the 200 dollars? I had it chipped with a superchips but removed it and am thinking about finding somebody to efi live tune it, but want to do all my add ons first.

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Old 06-01-2011, 09:28 PM
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i have heard either way on it, im also on the fence. i would say it would definetly lower egts quite a bit, and make faster spool up. i think i will wait on mine till i swap out the turbo for a different one then worry about it then.
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Old 06-01-2011, 09:52 PM
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I see, so probably no mpg or hp increase? Also, I see you have the swiss cheese air box on your truck, did it help? I thought about a CAI but keep hearing its a waste of money. Are you running the stock filter or upgraded?
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Old 06-01-2011, 10:55 PM
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I wouldn't say that there is NO increase in hp or lowered EGT's but it wont be huge by any means

the stock turbo and intake/exhaust can make 500hp
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Old 06-05-2011, 01:44 AM
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Not worth 200 dollars IMO, but there gains in adding an exhaust. And tuning will help
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Old 06-05-2011, 05:51 PM
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Quote:
Originally Posted by bigredtruck View Post
I see, so probably no mpg or hp increase? Also, I see you have the swiss cheese air box on your truck, did it help? I thought about a CAI but keep hearing its a waste of money. Are you running the stock filter or upgraded?
might see a little hp increase mostly noticable on the dyno, the cutting of the airbox seemed to help some but not a lot, it was free so i figured why not . it has a k&n in it now but i just picked up a bills custom intake with an s&b filter from a buddy for cheap so i couldn't say no haha.
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Old 07-11-2011, 02:57 PM
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The down pipe is definitely worth it, You could see a drop of up to 200* on the pyro. There will be a little bit more of a deeper rumble. As far as a HP increase, there is very little if any at all.
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Old 08-02-2012, 12:08 PM
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how do you lke the bills custom intake
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Old 09-23-2012, 06:45 PM
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I just put one on last winter. Waaay faster spoolup time.
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Old 09-27-2012, 11:22 AM
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Down pipe is definitely worth the money... You wont feel the difference that much but EGTs will go down quite a bit
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