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i guess im truck retarded, tell me why the check engine light would come on?
No back pressure, which makes the O2 sensor read wonky - not to mention will make the motor run worse just due to the lack of back pressure. Guys who are running the super loud flowmasters and cutting out the resonators are having problems. Lopping off the muffler entirely would be even worse.
I don't think you'll have a significant decrease in performance (it might even gain a bit wot/~4K+ rpm), and the exhaust note will give you a feel of more responsiveness. Not the worst mod you could do, and kinda fun...that's what it's about anyway! I would imagine you'll get a little backfiring with it open though. Looks like a nice piece though, I like the remote idea over a dash mounted switch...I had to bookmark the page for next time I need one for a project!