You will get mixed feelings on this one, but IMO the best bang for your buck is the S&B system. I don't think you will notice much gain with any of them as the stock system is more than sufficient. About all an aftermarket system is good for is a little more turbo whistle.
I have the AFE Stage 2 and love it, but I wish I would have known about the stock being good up to 500rwhp, then I would have spent my money elsewhere on the truck.
I think you can even modify the stock air box for improved air flow, according to ppe.
__________________ 2002 Chevy LB7 3500 CC DRW LS, white, debadged, spray in bedliner, B&W Turnover ball GN, 235/85/16 AT's, AFE Stage 2 CAI w/ resonator removed and plugged, PPE Boost increase valve, MBRP 4" downpipe back exhaust, AutoMeter Ultralight gauges in A-pillar, Injectors replaced at 140,460 (2nd time)
banks is the best intake...but for the money it may not be worth it...but i love mine!
__________________ 2001 Chevy Silverado CC LB7 D/A
EFI LIVE V2 w/ dsp5 Tuned by IDAHOROB, Suncoast Stage IV w/1057, Banks CAI, Intake Horn Mod, SS Tie-Rod Sleeves, PPE Boost Valve, 5" into 6" Single Black Stack, PPE High Idle/Valet Switch, Recon Cab Roof LED's, Autometer Cobalt Boost/Pyro,BFXenon 8000k HID's-Hi,Lo, Fogs and the Hi/Lo Switch, Cooper S/T's 265/75/16, Amsoil Synthetics from BIDDADDYDIESEL, Memphis Speakers...
Saving for a Cheetah or maybe Twins!
Special Thanks To: IdahoRob, Jessie, and Chris!
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