Many of you have been following the debate over the problems with the Donaldson "Blackwing" on the '02's. I put mine on my Z with 40 miles on it before I knew there was a potential problem. I had it on my '01 and had no problems with it. On Tuesday I started the car after it had sat for about an hour after a freeway drive. The "Service Engine Soon" light came on as soon as I started it so I took the car to my dealer. The two codes that were set were 171 & 174. My dealer told me these are Lean fuel condition codes and that the intake was the problem. They also told me that the GM zone service adviser told them that the oil used in these intakes messes up the MAF and causes problems. He also said that the dreaded air turbulance monster was a problem. I thought the problem with these intakes was supposed to cause a rich fuel problem, not a lean one? What do you guys that understand this Af ratio stuff think about this? I have a set of 30lb injectors for the car but I don't have them put in yet. :-?