Vortex - Review Klaus' posts about after market intake systems. I don't think you'll see much better performance than if you went with an Airaid filter and MIT and keep the stock air filter box - not the complete Airaid system which is open to under hood heat and possibly water ingestion. But thats just my opinion 
The Breathless Performance Throttle body upgrade with the the above Airaid setup seems very promising. I'd stay away from throttle body spacers and MAFS' (thanks KenP) - little or no bang for the buck.
Take or leave the coolant bypass - don't know how much performance gains you'll see from it. But what's $20.
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Yellow 03 Adventure w/black Grill, UM8 Touch Screen Navigation Radio, U2K XM Digital Radio, Remote 6-CD Changer, JBA Titanium Headers, Corsa Off-Road Sport, Airaid Filter & MIT, Nology Wires & Plugs, S&P Pro-Flash, Warn 9.5ti w/X-Line, Toyo Open Country M/T 37x13.5.
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