If you get it tuned up to 11 psi you can go down in boost, but not up, with out re-tuning. I have a Greddy Profec II Spec B tuned to 10.5 on the high setting, I cruise around on the low setting most of the time and it is set for 7.5
Last edited by jhuckstead; Mar 17, 2006 at 08:06 AM.