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bertherr, don't take this the wrong way, but I don't think merely replacing your air filter with a "high-flow" one is going to give you any HP increase.

 

I used to mod my Legacy quite a bit, and then a few things went wrong with it that I needed to fix. Then I caught a bug where I started fixing things that weren't really wrong but not performing at 100%. I still have the bug now. And would you believe my Legacy is a lot faster now, completely stock and running absolutely flawlessly, then when I had a couple mods done to it. My motto is: You have to make a car run right before you can make a car run fast.

 

I have a cheap $10 Purolator air filter in both of my cars right now too... and that old Cavalier Z24 that was tooling around with me last night can tell you my Legacy isn't exactly slow :D

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Haven't tried them myself, and here's why:

 

1. Look at Fram's other products. Everybody I've talked to about oil filters says that Fram is crap.

 

2. Just changing your air filter won't make much difference.

 

3. If I was going to just change my air filter, I would not use a K&N or similar product because they allow larger particles through. For example, a K&N will allow particles through that are 30 microns in size. My Unifilter pod filter that is sitting on my custom intake passes particles smaller than 1 or 2 microns. You may think that as long as the big stuff gets taken out it's okay, but that's not the case. Caterpillar diesel fuel pumps failed in droves when they ran on 3rd world diesel with 15 micron filters. After switching to 2 micron filters, the pumps lasted exponentially longer.

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