I'm sorry for reviving this post but I held back purchasing this because after posting this I got a message, from someone claiming to be a Hummer tech, saying that any after-market exhaust would degrade my trucks performance.
I waited and tried to get in touch with this Hummer Tech but haven't heard from him.
If you are still on this forum please PM me if you have any new information on after-market exhausts. I am looking to upgrade my exhaust system in about two weeks.
Thank you.
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