[raldenlee]

I live in Santa Fe at 7000' and have used both jb4 and, now BM3, and I've come to conclude that their both worthwhile and make a noticeable improvement, but the limiting factor is the stock turbo. It just can't produce the boost pressure that these mods are targeting at higher rpms at my altitude. I have logs where target is 21 - 22 psi at 6 -7 K rpm and MAP psi is only 16. Boost is much closer to target up to 4500 rpm and then drops off fast. Of the two mods, the BM3 is smoother and more gradual while the jb4 hits harder under wot but sometimes feels uneven and sometimes even jerky.