2003 5 speed with 48k on it. JLT RAI, BBK catted X, Magnaflow catback, and 4.10's I am happy with the reuslts and have a tuner and "Roy's" spacer on the way to finish it off.
The 4.10's are probably costing you afew RWHP on the dyno, but with a tuner and spacer you'll be right at 300RWHP, maybe alittle more.
Yeah, with the normal mods (CAI, Catback, Midpipe, Tuner) your always gonna be right in the 297-300 range. With the spacer you may come in at 302. Torque varies in the 315 range.
Congrats Grover.... Your right about where you should be IMO. My car put down almost the exact same numbers when I was running stock manifolds, catted midpipe, C&L maf, & a stock tune... I think my car made somewhere around 280-ish rwhp & 294rwtq.... I think what was costing me a few horses on the dyno was my heavy 18X10" wheels & 295's.... I think with stock 17X8's, I woudlve put down 3-5 more horses...
You have a link to "Roy's" spacer, I think I want to replace the Paul's HP one I have because I hear the Roys is better.