[gothicaleigh]

whats that huge hose/air inleft in front of the radiator?

That's part of the Multi Ram Air Induction System and is controlled by the engine throttle. The dual piping is to control resonance. It's the same system found on both the 3.0L Catera and 3.2L CTS.

Both cars come stock with a ram air system. The "TonyA" mod you see many CTS owners bragging about is simply opening this system to fresher air further from the engine compartment and lessening restrictions in the air box and stock filter.