Fast Intentions Resonated HFCs, no question about it.
We've been a vendor over on myg37 for nearly 5 years now and over 100 clients w/ them and not a single complaint. If you need any info or feedback on them, there's endless information about them and reviews in this
Thread (clicky)
Cats run through a 300 cell catelytic converter followed by an 8" resonator. Its a complete win win product, added gains, no raw fuel smells, and still resonates. WOuld also be a perfect compliment with your current setup!