These cars hate heat, so, If you drove it up there and then hot lapped it, I'm not surprised you are disappointed, plus these heads don't respond to normal work on the short side radius of the exhaust ports according to the experts around here...I would advise getting it on the dyno and make sure the tune is right. Dave can work miracles with these cars but each one is an individual so while the chip is, I'm sure, close enough to drive the car safely it may not be optimal for racing it....................Dan