K&N is really a bad idea. our motors have no throttle body, so even at idle there is no vacuum to speak of in the manifold. the stock air filter is more restrictive than a K&N would be, but it is oversized for the need of the motor. a K&N unless weekly cleaned & OILED is going to be noisy, and it will allow fine dirt into the motor. get a quality stock style filter and your motor will be happy.
John

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!