09-03-2011, 08:47 AM
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Seek to understand,^Value
Location: San Jose, California
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Join Date: Mar 2008
Posts: 17,118
Mein Auto: 02 BMW 525i M54 automatic
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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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