After searching around and checking out Dinan.... I have to admit I'm not very impressed. The chip does almost nothing... which is understandable because BMW tunes their engines well stock. High flow exhaust, 5HP? Not much gain for a 225HP stock car; exhaust is usually 5%. The only thing worth it seems to be the cold air intake. So say I speed $2000 and get all these things and get a whole 15 extra horsepower.... I probably won't even feel it. My Audi A4 is 170HP stock. 200HP with chip. 215 with cat-back exhaust. 240HP with turbo upgrade (less than $1000). Given, it's a turbo, but seriously, for the same price you can add either 15HP to a 530 or 70HP to an A4. I'm thinking I might just sell this bimmer and the A4 and buy a 2001 Audi S4 w/ 250HP stock, 300-320ish with chip, and somewhere over 350HP with turbo upgrades.
Unless... there is some amazing mod I'm just missing. Any kind of supercharger for bimmers? Don't get my wrong, I love bimmers, it's just sad they don't have a large modding potential. I have to admit I would love driving a 5 series with coilovers to get rid of this "boat/floating" driving effect. Nice for long drives, not for cruising.