yea the z06 wheels were on....havent check the plugs and wires, they're stock with 72,000 on them. air filter is fine, fuel filter, never mesed with it. the car pulled v ery smoothed and didnt skip or sputte in the high rpms any. the same day, actually an hour before, a 99 SS w/ lid and flowmaster dyno's 300 rwhp, and an 01 T/A with lid and catback dyno'd 322. so the weather wasnt a factor at all.

runs were done in 4th and those numbers are corrected.

 

3 in piiping it the best

 

single 4" exhaust is about the same cross sectional area as dual 3" pipes.

 

72,000 miles on the original fuel filter; i wouldnt be surprised if the motor is being starved for fuel. im willing to garuntee that if you replaced that filter (less than $20) youll get a couple more hp out of it.

 

Get a cutout if you are afraid of scavenging. I will be putting on a 4" on my nitrous car, and have had one on my SS before.