Has anyone installed one of the 3+ psi boost pulleys available from Auto Specialties Performace (ASP) on a supercharged Xterra? They claim all that is necessary after install is to allow the computer to re-calibrate by clearing the memory (i.e. disconnect the battery for a few minutes). I'm curious whether anyone who has installed one has felt the 26hp rear wheel increase they claim and whether you had any problems with knocking on 91 or 92 octane premium gas. They also claim that no change is required in octane rating.

Thanks!