Back in mid '99 I was running a 6m-gte (not sure of the mileage, was told 50k) w/ 2.0 hks MHG, 440's, walbro pump, S-AFC, and a paxton FPR. I had a stock ct-26 pushing 12psi daily and ran 15psi for race. Never snaped a rod or crushed a piston ring land, however I had dyno tuned this thing very well. I ran this set up for almost two years - this motor was pulled in favor of the 7m and is still running fine in a friends car today. Get Corky Bell's book "Maximium Boost" it is a very good read - in short, you can run as much boost as you want, so long as you do not pre-detonate the poor beast to an untimely death.