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Originally Posted by Hal88
I had it installed in my 4.4 and I never had any problems with it, I didn't notice much improvement on perfomance , the growling from the eng. was nice tho. I took it off because I moved the truck to CA and I heard that it wouldn't pass the smog check, now I have the AFE for sale.
Pm if interested.
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i agree, no obvious power gain and just a little roar and yes, it will fail your smog test. ask zerochief if you want to confirm.