[Piotrsko]

My '00 is 530 lb/ft and the last year with no cat, although some have one possibly by location or build date. No O2 sensor. The 7psi wastegate is to keep from blowing apart the intercooler system and limit torque as the zf6 input shaft and bearing fails around 550. Many wire the wastegate shut then proceed to thrash the trans. The auto doesn't have this limitation. Fwiw, mine doesn't know what the mixture ratio is, but has a map sensor so it boosts and fuels based on air density in the filter box. I really think the turbo is bigger because it changes with the bump hood mid year '00. they had more room and you can never have too much turbo..... more air means you can add more fuel and get more power, doesn't necessarily mean more efficiency