Im happy with mine.
Took a day or two to throw the code. No biggie. Noticable gains and deeper sounds. Smoked tires in first and second gear the first time i drove it after i installed them
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Mods: Hennessey CAI, MBRP Exhaust, Stainless Works 1 5/8 Long Tube Headers and High Flow Cats, Trifecta Tuned