ForceOne, ask for the "Cat-back Dual exhaust" for a 300m. These are legal, and as long as you don't change any of the emmisions devices (egr,pcv,cat) you can make any changes you desire. As far as I know this is true even in Colorado. But don't forget, if you open up the exhaust with a dual cat-back system, you will lose some low-end torque. Make sure you are putting enough air into the engine to make a high flow exhaust worthwhile. I do have some ideas for a "Ram Air" system, but until I actually measure I would hesitate to post (please don't flame me!!!). E-mail me and I'll give you my ideas. Plus if you live close to me, maybe we can work out something together. By the way, what type of spoiler did you get (from who or what car)?