Crucial Racing Shorty Down Pipe
This is the 'old' style, it is a direct replacement for the factory piece. It is 3" but tapers to 2.5" at the flange to mate to your factory 3rd cat pipe (or any after market 3rd cat pipe that is also a direct factory replacement).
It is divorced waste gate style and thermal coated to keep under hood temps down. More info about Crucial's coating process: :: Crucial Racing Systems - The parts you need for the performance you want
I bought this pipe used from a NASIOC member (Here is the original thread: FS: (CA) Crucial Shorty Downpipe, Catless, Divorced Wastegate, Coated - NASIOC. I reused his pictures, ha.) and ran it mated to the OE 3rd cat along with a COBB cat back and an AP stage 2 tune for about a year with no problems what so ever.