don't put a bov on these cars or any car with a MAF. The sensor can't detect the loss of air from running voa. get a bpv turbosmart or forge or cobb xle
Wow I hate my stealership... You got yours covered under warranty?? They said primary o2 sensor wasn't covered under warranty... likened them to spark plugs.
If your throwing a CEL with too lean of conditions have you ever thought that the problem was your fuel pump? They had an issue with some earlier '07 speed 3's and actually changed the fuel pump design, although your car is an 08.5 this might not be the case.
But the ECU would definitely turn...
I just had a new tubo put on under warranty due to this problem. What really exacerbated the problem was turning on the AC, then it would blow tons of smoke even when just idling. Otherwise it was not smoking a whole lot but still had blown turbo seals.
Installed the SU motor mount and TWM short shifter and bushings. Huge improvement, other than that its stock. Next mod up, CAI.
'07 Mazdaspeed 3 GT; True red
Will get a pic with the sick winter rims when it gets colder out.