Sorry, I'm not to smart. What does "ORP" mean. Also, if I got a throttle body would I have to change the predator tuning at all? I'm going to order my tune today and is there a difference from "Toms" predator than others? Thanks again[slap] [goofydrunk]If you want the sound, I would go with Borla mufflers all the way. Had the SVT borla kit on my first Focus with a race header and the sound was mean and deep. That said, on the SVT the only exhaust that shows power increase is a 3", and I don't think that Borla makes 3" mufflers (maybe race mufflers, but not oval ones).