There are several makes of header on the market but I'd recommend one that has a 6-into-2-into-1 pattern with a 2.5" collector. An exhaust shop can fabricate a 2.5" mandrel-bent downpipe for you.
You'll need a chambered muffler to keep the drone down but if you're going catless, you could replicate my set-up with a Flowmaster 2.5" chambered muffler where the cat normally sits, and a Magnaflow 2.5" straight-thru muffler directly behind it. The sound is deep and sporty with no rasp and no drone.
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