K & N Filter And Cmi Exhaust

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10-03-2002, 09:37 AM

MIKE H

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K & N Filter And Cmi Exhaust

IS IT POSIBLE TO PUT THE K&N FILTER SYSTEM AND A LESS RESTRICTIVE EXHAUST ON A 502 MPI WITHOUT CHANGES TO THE CPU SYSTEM WITHOUT HURTING THE ENGINE.

10-03-2002, 12:29 PM

blackhawk

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This is not first hand experience. But, I was told that a K & N filter and performance exhaust system will make the 502EFI run better(leaner). They are a little rich from the factory. Not much in performance gains though.

10-03-2002, 07:47 PM

liquid asset

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I've done those exact mods and ran to lean send it to Arizona speed and marine I got an oso discount cost me 300 www.azspeed-marine.com

Last edited by liquid asset; 10-03-2002 at 07:49 PM.

10-05-2002, 06:53 PM

baja 272

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I'm running CMI elbow tops and the K&N with no problem at all. I didn't pick up much speed though. I was told that Merc sets them up at the factory to run rich.

10-05-2002, 11:00 PM

crmax

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if it isnt running leaner you havent made any more power, if its running to lean you can install an adjustable fuel regulator and bump up the fuel pressure till you get a good reading on your plugs

10-06-2002, 07:43 AM

Ric232

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I've done all of these mods, including the fuel pressure regulator (set at 48psi per Arizona Speed's instructions). What do I need to look for on the plugs to make sure I'm not running too lean?