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i have the full magnaflow cat-back with the 22" muffler.
That'll come the day after someone will take my money and sell me a kit. I'm actually making a couple calls about that today.
I say 350 tops. I'm a little jaded with this thing. lol
I'm going to call ARH and forward a link to this thread to them. They just redesigned these headers because they said a few 2012 guys had some fitment issues. This set as well as all new sets should fit all 09-13 trucks without modification. I will post their response once I hear back from them.
You said the sound is amazing, but have you had a chance to check on performance gains? I know its hot outside today with about a 35 mph wind, but maybe tomorrow will be a little more ideal testing day.
dyno at 3pm today.