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M3n2c3 · 2006-07-01, 07:17 PM

I cleaned my K&N air filter element last night (and what a pain in the ass - I think I may just go back to stock paper elements).

I noticed today that at WOT now, my engine has a remarkably deeper, noticeable low growl at the low RPM range that it didn't quite have before. It just kind of sits below the normal engine noise. There's no change that I can perceive in the car's power output or acceleration characteristics, either positive or negative - but the butt-dyno's never very accurate, is it?

I know I'm not imagining the sound because my wife commented on it this evening, and she doesn't usually pick up on subtle differences in the car like this.

Now, I cleaned and re-oiled the filter according to the instructions. I'm pretty sure that I didn't over- or under-oil, but I'm uncertain as to what change in the filter might cause my engine to sound deeper.

Any ideas, or is this something else that I'm concerned about unnecessarily?

2006-07-01, 07:17 PM	#1
M3n2c3 EJ205 Real Name: Jeremiah Join Date: Jul 2005 Location: Dayton, NV Posts: 1,888 Car: 2005 Impreza 2.5RS, 2000 Forester L Class: RNP sometimes (see motto) "Kids are ruining autocross."	Air filter service question I cleaned my K&N air filter element last night (and what a pain in the ass - I think I may just go back to stock paper elements). I noticed today that at WOT now, my engine has a remarkably deeper, noticeable low growl at the low RPM range that it didn't quite have before. It just kind of sits below the normal engine noise. There's no change that I can perceive in the car's power output or acceleration characteristics, either positive or negative - but the butt-dyno's never very accurate, is it? I know I'm not imagining the sound because my wife commented on it this evening, and she doesn't usually pick up on subtle differences in the car like this. Now, I cleaned and re-oiled the filter according to the instructions. I'm pretty sure that I didn't over- or under-oil, but I'm uncertain as to what change in the filter might cause my engine to sound deeper. Any ideas, or is this something else that I'm concerned about unnecessarily? __________________ Small red text that looks curious at first glance but is ultimately inconsequential Last edited by M3n2c3; 2006-07-01 at 07:49 PM.