Being that it cost me nothing to have the dealer install it, I am pleased. It's a little more responsive and a bit more "winey" around 4500rpms. If I had to pay the full shot, no way!
I would have done the after market upgrades and say the hell with the warrenty issues that might pop up.
After much searching and discussions I just replaced the standard paper filter with a cotton performance filter......immediate improvement in response and the engine is super smooth......doesn't have the additional air opening at 4000rpm....but also doesn't have the $1000 price tag....mine cost $160.......and it is the same one being used by many in the JCW air box.......I would reccomend to anyone.
I got the new panel filter from my BMW dealer who fitted it for me......Doncaster Motors in Melbourne. The service manager there runs a JCW and knows his stuff on the upgrades....JCW and after market....I would advise anyone to talk to them. As to the picture provided......the BMW service manager assures me that he uses a panel filter in his......whatever....the car is definitely smoother, more responsive and a bit quicker through power curve. 15% pulley next.
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