Mike thank you! Now that would make perfect sense as to why they are plugging into the air flow sensors. Its kind of hard not to trip out an O2 sensor when you dont take into consideration the air going in! I had no idea that the fuel system was closed loop. This also answers my other questions of lean tuning. Would you happen to know if the 320i can handle the 4psi boost? I know the piston heads are different from the 328i. I also didn't know these engines run afr of 14.7:1. thats pretty lean. if i did that to my last vehicle it would be in flames lol! Again thank you for your reply.
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