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I hear what everyone is saying and when I get a chance I will go get dynoed just to be sure. I've been real good friends with jwaknbeef for a long time now and all he has ever owned is mustangs, so I have no doubt in my mind that he knows what he's talking about. And, thanks for explaining to...

Cool Thanks. Exhaust: Borla w/ catbacks

OK, I found a dyno shop that I can take it to. The guy said something about $79 to see what the horse power is and an extra $35 to see what the air to fuel ratio is. What is it that I need to know from this test to Know if the modifications that were done won't hurt or will hurt the car?

Yes it is an idle pulley. I knew he told me what it was, but now once you said that I remember him telling me that is what it is. And, I talked to him yesterday and he said it was more like 470 RWHP. Yes he did give me the Predator hand-held programmer with the car. As far as the pulley size...

I just got my '03 Cobra Saturday and I try not to drive it alot but I can't help it. It's like I'm addicted to it. The guy I bought from did a couple of modifications to give about 500hp at the tires.

Thanks for the input. I'm going to research these options and go from there.

I have close to 500HP at the rear stock tires (275/40zr-17 tires on 17x9in rims) and they need to be replaced. On launch from a dead stop they tend to hop. So, my question is what size tire should I get to prevent the hopping from launch?