Stock Gen II car: 405 RWHP, 440 ft/lbs
Add filters & smooth tubes: $100-$200, 415 RWHP, 445 ft/lbs
Add catback 3" exhaust: $600 - $1500, 420 RWHP, 450 ft/lbs
Add high-flow 3" cats: $350 - $600, 425 RWHP, 455 ft/lbs
Add AL flywheel: $500, no dyno-visible gains but substantial power increase in...