i ordered the catted downpipe and the dual-tube also. the dual-tube should arrive tomorrow. i saw and heard this exhaust in action and it sounds sweet. it was on an 04/05 with shorty dp and stock third pipe. i recorded it too and i just keep looping it cuz its so sweet i can't wait til i install it... and with the 2.5L, it should sound deeper than the 04/05
oh, and just so you know.. its a single 3" diameter into a resonator (which is that huge straight piece), and the resonator splits into two 2.25" tubes that dump to the canister with a single tip (i think is 4"... i will measure mine).
be on the look out for my post too heheh.. i guess there will be tons of posts with these new pieces that perrin put out.