So you're a rocket scientist and you're driving around a mazda??? Hmm... I think you need to renegotiate!! Anywayz... I thought at first it was a placebo effect as well, but you sound like you genuinely can feel a difference... I'm not sure if I'd be willing to drop a couple hundred just to see if it truly does... afterall, I doubt Injen just takes this stuff back! One question I do have is... did you have it installed or did you do it yourself? If you had it installed, how much did it cost?