I can get Stainless Steele Hi Flow Cats that our tolerant for our cars considering the amount of heat they generate with or w/o Air Tube. PM for details.

 

Thanks, GoodfellaFD3S.

 

i was in tha same position just a couple of weeks ago...didn't know whether to go high flow or MP. Well, a friend made me change my mund (for the good) and i went for the high flow. I got the one from Gotham Racing for $265 and the cat is very HIGH flowing. Even only at 12 psi the car losses the rear in first and 2nd gear...I am very very satisfied with the product...The high flow cat will significantly free up at least 15-20 horses rear wheel....In my opinion, go with a High flow and u'll be satisfied!

I hope i was some help. Check out my sig for my setup

 

The backpressure in the exhaust creates torque even in a turbocharged situation?
I always thought that the least resistance on the exhaust on a turbocharger was best.