It was hilarious reading this thread ...
To the OP ... read these ...
- CAI 101 should I do it or not (
1) and which is better, stock or aftermarket cold air intake (
1) (
2) & a home-made CAI (
1) & the general consensus on the effectiveness of an aftermarket CAI versus the stock BMW CAI (
1) (
2) (
3) (
4) (
5) & how to reduce the risk of hydro lock (
1) (
2) & what about a K&N oiled air filter over the stock air filter (
1) & a forced induction group buy (
1) and adding nitrous oxide to your E39 (
1) & links to suppliers to improve performance of your E39 (
1)