it comes with a down pipe because it says from the turbo back so it is from the turbo to the tip straight pipe looks like it is good but i would rather find one like that or another but just stainless steel because SS is better than aluminized IMO but it is all up to you it is a good system and the price is cheap to
99.9% of all exhaust systems for the duramax that say turbo back are really down pipe back. That doesn't necessarily mean the exhaust in question doesn't have a down pipe it just means that the chances are pretty good it doesn't. If you could post a link or attach a picture it would be pretty easy to see if it did or did not have a down pipe
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