RIF....(Readng Is Fundemental)
<<<Bimmerfest's E46 Wiki>>> Read this before posting questions!
Facts:
Your car came from the factory with the most effective CAI that was ever designed (and it`s free !) Aftermarket units make the intake noise louder and often annoying.
You`ll find lots of exhaust clips on Youtube....
There are no "tunes", chips. etc. for ZHPs that are worth the price of admission. Save your money.