Maybe I should be more specific. I use my car for track days, and solo 1 events. So what I'm wondering is, has anyone used more than 19 psi (285 hp/305 tq @ the wheels) for 15 minutes or more at a time without blowing their engine? I have a 2.5 with a lot of mods. I'd of course, like to have as much RELIABLE, useable power as I can. Dave Krulitsky 1986 glht