Stuck a single 4x14" round Magnaflow right after the Y pipe. MUCH better.

Still has a noticeable interior resonance around 2-3K, but the rasp and popping is gone. Not to mention that high RPMs sound much more tasteful.

Sounds just like a magnaflow catback but a tad louder. I'll grab a soundclip if I can remember how to work my DVD camcorder.