I am running 12.5 psi and I still don't think I've maxed my stock MAF out. I guess I'm not totally sure, but tuning on the street has not been an issue so I haven't kept a close eye on it.autocrossing wrote:I maxed my rb25 maf out at 280whp, that was on stock turbo at 9psi.I upgraded to a Z32 maf, google 'nissan MAF wiring' pretty sure I found the info on JWT's site