Drew's cold air tube is 4.5". And he used a good air filter and velocity stack. Very nice set ups. Shaun is who Drew and I used for our tunes. Shaun has them dialed in real well. He worked with Adam @ Rev Auto to dial in the throttle body and driveabiliy, and it is amazing.
I don't think you will see 500 with out cams. Depending on the dyno. The dyno at Dean's Performance seems to read lower than AED's dyno. About 15-20 rwhp different. But yet Drew's car and mine seem to have run better numbers at the track. That is what really counts anyways. Real world performance. I think you will be around 470-480 on the DP dyno. I hope to get mine on the dyno in a week or so to see where my car stands.
Any idears on what it'll take to crack that 500 NA mark?