[meford4u]

That sounds wicked. I actually talked to him this week about moving the cat under the car, but he wasn't sure if he wanted to spend the money or not. We talked about eliminating the cat, for now, and just putting in a flex tube, but upon further review we found out that would cause havoc with the O2 sensor down the tailpipe--I think that's what he said-- and cause us all kinds of problems.
The car already has stage3 cams and heads, so no need to go digging there. At this point in time he is really just trying to solve the rich at idle, lean under load problem. He felt that if he had to take the OEM cat out, then what would it costs to just toss the old cat and put in a hi flow. Truthfully, I like your idea better, will toss it off him and spend his money from there.
Moving the cat under the car won't cause any O2 sensor problems downstream will it?
The car has a Focus tuning/scorpion stainless catback exhaust--2 1/2" I believe with a JBA cat forward short header.

Great info guys.