have a 330xi and need to change the brakes. I'm thinking to install zimmerman cross drilled rotor's, but don't know of a good pad to go w/it. I know that OEM does a great job of stopping her but i like the look of the drilled rotors and hopefully the improved performance. Also i would like to add a cold air box or upgrade the air filter for improved air flow. I know that improving the air flow does little if the exhaust isn't also "opened up", plus i have an exhaust leak (a small puncture in the pipe) I was thinking either a borla or supersprint muffler, any input? Also how far back should i go (header's, cat, or just mfflr)? Last she needs a tune-up which i plan on bringing to BMW service, any suggestion's on parts or what to ask the serviceperson to look for when she's in there?
i just had the coil's replaced (under an extended wrrnty thank god) and she still seems to not be running 100%, she idles slightly rough at light's and noticed decrease in mpg, any one else have similar problem's?

exhaust:
http://www.understeer.com/onlinestore exhaust.shtml