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Russ Dickey Hi Russ First thing I would start with is the side pipes. They can cost you 20-60 hp racing. I you want to know if they are causing too much back pressure, tap a small hole on the inside of the pipe, buy an Cat Convertor tester. You only need the high temp hose and gauge. Take the car out for a drive and do a wide open throttle with SOMEONE watching the gauge Your reading should be no more than a 1 3/4 pound pressure. If more you have too much back pressure. The exhaust is designed for the street not racing. I would go get the car dynoed to find out the power output. You can do 1/4 mile runs on the dyno and tune it up. You did not say gear ratio your trans has. Your rear should have 3.55 to 4.10 depending on what you want to do with the car, cruising,autocross,1/4 mile, or roadracing. The cobra can do it all with the right set up. Change the pipes and dyno the car. You will know where the power band is, Torque is more important than HP to me. I have 340 hp and 428 tork. I can break the tire loose in 3 gears with a 3.31 rear. I run my car easy at the 1/4 mile for brackets and run 14.1 with two gear shifts. Your motor may need a LITTLE bigger cam to go with the intake and heads. 9.3 is not bad for racing. Valve springs could also hurt the performance of the motor. If weak, they will float the valve at a lower rpm, nopower. Start with the exhaust than go to the dyno. Good luck Let us know what happened. Rick Lake
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