IIRC, Ray addressed that in a different, older thread. I believe his response was something like: he would insist on doing some tests to the car to make sure it would survive the rigors of tuning, so that he could be reasonably sure that he wouldn't break it.

Don't take my word for it, though. Do a search for that thread.

 

he gives everyone a compression test before he does anything

 

Ray tuned my FC. Great guy!

 

Pfs Its The Best Ray Realy Know What His Doin He Tune My Rx7 Fd And Built My Motor Bridgeported Tune @19psi 578 Hp I Took It To The Local Track And @ Low Boost 10psi I Did 11.7 In A Quater Mile @ 134 Mph I Haven't Tried The 19 Psi Tune Yet But I Will Soon And I Drive My Car Every Day And Every Where With No Problems I Have Ac ,power Steering My Car Runs Great Never Had Any Problems Its Been 2 Years Since Ray Tune My Rx7 Ray Its Very Helpfull If You Ever Need Any Tech Support