Because you can't log with a wideband O2 sensor with the standard HPT box. you can how ever with EFILives V1 cable. As long as your not looking to tune anything newer then 07, then it would suite you fine. ($550) You can download EFILive's software from Download Software and play around with it. It will be in demo mode till you register it. PM me if you have any questions about it.
01 ECSB 1/2 ton 4x4 6L GMC
11.03@127
KB Racing Borg Warner S475 turbocharged
Yeah I wish I'd gotten the PRO just for the wideband o2's. I'm currently scouring the web looking for a way to translate narrowband o2 readings to A/F, but supposedly it's still not very accurate anyways.
2000 Sierra rcss, LS6, xr265hr-15, HP Tuner, B&M, traction, cai, 2-4, 3.73 G80, Centerline, Pacesetters w/custom pipes and mufflers