That was AFTER the K&N filters. However, I noticed no "seat of the pants" difference with them. I haven't actually dynoed the car yet. I came up with those numbers with some mathematical equations.

I took the known weight of the car with me in it and 8 gallons of fuel, the transmission and final drive gear ratios, the 1/4 Mile elapsed time, 1/4 Mile Trap Speed and extrapolated it from there. That method is actually more real world accurate, as math doesn't vary... Dynos vary alot from one place to another. I've actually seen dyno operators "modify" the dyno so that the customer thinks the car is making more power that it really is. The other problem with dynoing our cars is the 5,000 RPM fuel cut when running just the rear wheels. The car actually makes peak power at its redline of 6,000 RPM.