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Old 09-03-2011, 08:47 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
You're not the first to ask.

Start at the bestlinks ...

- 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) and of the K&N oiled air filter over the stock air filter (1) & how to reduce the risk of hydro lock (1) (2).

For suppliers, this is in the bestlinks when I search for "performance":
Performance,mods & repairs
Also this:
Performance Upgrades
BMW Performance Exhaust Systems
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