there are alot of systems that have high flow cats,
Cobb
Helix High Flow Catted Downpipe STI w/ some other cat back
TurboXS Turbo Back Exhaust (Catted) STI
MRT Turbo Back Exhaust System w/ Cat
AVO Turbo Back Exhaust System w/ what looks like a cat
Zerosports Exhaust System w/ Cat
B&B JDM Look Turboback Exhaust STI w/ Cat
and probly many more
