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I got a K&N typhoon intake and a Magnaflow cat back exhaust and it feels like I actually lost power. Is it because the computer needs to get used to the new amount of air from the intake or something? Any help would be great?

I just bought a 2007 Mazdaspeed 6 GT and am looking to get a CAI and some exhaust parts. For the CAI im not sure if i should go with the CPE Xcel, injen, or AEM. Anyone have any suggestions? pros/cons? In terms of exhaust I'm looking to get a cat-back exhaust and downpipe. Anyone have an...