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Diesel Exhaust


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Thanks for all the advice. I ended up buying a summit brand exhaust. It was only 312 shipped to my door. It took about 2 hours to install. Half an hour to take the old one off and an hour and a half to clean the rust off the down pipe flange so the clamp would tighten correctly. It sounds a lot better and it seems the the turbo kicks in a lot faster. Very happy with it so far have to wait for the programmer.

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  • 2 weeks later...

As a GM tech i can tell ya that with a improperly tuned dmax with a chip does some serious damage. I have seen it first hand. Make sure at least put a egt gauge in to mointor your exhaust temps. If you still have factory warranty you might lose it if the dealer finds out you had a power up device on it. Personally I'm strongly against power up devices but to each his own. I work on dmax's all day long and they are strong engine. Had a customer install a chip on a lly motor and burnt down two holes in the block. melted the tops of both pistons and scored the

the block. That little repair cost him his job with the company and he had to pay about 15,000 for a new motor plus labor. If you know how to use the chip wisely you might be safe.

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I'm a duramax tech at a gmc dealer.... be careful what you do. You are limited to 100 extra hp on the tranny. i run a 4" all the way back with hypertech on 3. NO PROBLEMS. Go mild and just get an exhaust with hypertech and you'll be fine. As mentioned before an EGT gauge (pyrometer) is a must !!!!

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