All right gentlemen I finally pulled my ECU and sent it out to Danos today. I'm going with a Decat, slip-on and stock air filter. I've been searching through some of the threads on here and came across a few about bumping the RPM limiter up to around 12200 but I have not seen any discussions about maximum safe RPM for these engines. I really don't flog mine up to redline too often and I haven't hit the limiter yet even though you really can't see the tach on these while you're trying to watch down the road at maximum thrust. LOL so does anyone have any idea what these puppies will take.