Hey all I have a jcw r58 and having some issues. First wanted to find out what stock psi is on it. Since I got tuned I have been pulling a P2B5B code for the air flow sensor when I hit 14.5-15.5 psi. If I remember right my stock tune showed on my ultra guage 16psi and was fine. Curious if my tuner needs to drop the psi down or if it truly is a faulty MAF sensor. My tuner said the car should be hitting 21psi no problem but I'm not even getting a under boost code. He said he's going to dig more into my file but wanted to see if others had this issue with the maf after getting a tune

 

FWIW I had a P2B5C code that stayed
with replacement of the MAF but was
fixed with replacement of the throttle
body.