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Message: <blockquote data-quote="E46Fanatic" data-source="post: 278791" data-attributes="member: 81">I've done the K&N drop in at Calvin's place yesterday. Overall its a smoother engine response from my assessment. IN terms of raw power improvement, it seems to be more free revving, but only a back to back comparo with a stock 325i will truly tell the advantage. The car is already pretty decently fast on WOT, so I cant really gauge the difference. Any volunteers hehe? Also the engine note is slightly different on high rpms. A bit lower pitched and louder. Will continue to monitor. BTW the job to swap out the filter took Calvin less than 10 mins. Easy to swap back to orig filter if you wanna do this before svcs.</blockquote>