Slegacy96 Posted October 29, 2005 Share Posted October 29, 2005 Im lookin for a high performance air filter. So which one's the best? HP increase? MPG increase? Link to comment Share on other sites More sharing options...
Nicko1245 Posted October 29, 2005 Share Posted October 29, 2005 I just replaced my air filter with a K&N. Those are the best all around air filters that you can buy, you never will have to replace your air filter again. Link to comment Share on other sites More sharing options...
Ranger83 Posted October 29, 2005 Share Posted October 29, 2005 This is for a '99 Legacy GT? You will note that plenty of people make claims about performance or mpg improvements for K&N and other after-market air filters. But I've yet to find one who carefully documented the performance and MPG of the vehicle before and after the change. I'd expect the mpg improvement to be approximately zero. And the performance improvement at public road speeds to be approximately zero. With the importance that buyers place on the EPA sticker #'s and 0-60 performance, if they were better they'd be OEM. The trade-off in engine wear due to particulate matter and increased noise aren't worth it. Link to comment Share on other sites More sharing options...
Chip Posted October 30, 2005 Share Posted October 30, 2005 Ranger is right. If they were so great, they'd be installed at the factory. If Subaru could gain event 1 or 2 MPG AND increase HP by even 1 or 2% by installing a so called "low restriction" air filter don't you think they'd do it ? Ditto for the so called "cold air intakes". Link to comment Share on other sites More sharing options...
nipper Posted October 30, 2005 Share Posted October 30, 2005 ALlow me to introduce you to the search button .... do it on airfilters. I just did this yesterday and posted it in a long thread, and sorry folks not up to it again. My pain pills for my back are giving me a nice ride. Detailed test on GM duramx Deisel and aftermarket filters. Guess who came out on top...the OE airfilter. any filter that has better air flow has to have larger poors, and let more air in, hence more dirt. The pistons can handle it, but the fuel injectors cant, nor can any sensors down stream from the airfilter. nipper Link to comment Share on other sites More sharing options...
benebob Posted October 30, 2005 Share Posted October 30, 2005 I agree with Nipper. Sure you might get 1-2hp by running a less restrictive filter but for longevity it definately isn't worth it. On a side note I've run my XT6 without a filter vs with on autoxing and have had a better time every single time when there was a filter on. (the engine is toasting slowly so I'm not real concerned about airborne diseases getting past!!! Link to comment Share on other sites More sharing options...
Setright Posted October 30, 2005 Share Posted October 30, 2005 Chip, noise and emission regulations limit the factory options. If oiled gauze is so bad, why does STi produce one? And many Subaru's have CAI stock. The older models draw air from the fender, interim models from behind the headlight (dubious CAI), and newer models suck from the bonnet/hood lip. Link to comment Share on other sites More sharing options...
Slegacy96 Posted October 31, 2005 Author Share Posted October 31, 2005 I can honestly say that I have no clue what kind of filter to buy now. Link to comment Share on other sites More sharing options...
NoahDL88 Posted October 31, 2005 Share Posted October 31, 2005 The factory filter will filter out smaller particles then the KN, so for longevity the OEM would be best. I bench flowed the air box and intake on a flowbench, you get 3 cfm tops, which on a good day might get you 1 hp. My opinion, don't waste your money. the reason everyone claims that they got so much hp from an air filter, is because they don't want to feel like the idiot who just spent 70 bucks on somthing that didn't do anything. just my .04 Link to comment Share on other sites More sharing options...
Slegacy96 Posted October 31, 2005 Author Share Posted October 31, 2005 The factory filter will filter out smaller particles then the KN, so for longevity the OEM would be best. I bench flowed the air box and intake on a flowbench, you get 3 cfm tops, which on a good day might get you 1 hp. My opinion, don't waste your money. the reason everyone claims that they got so much hp from an air filter, is because they don't want to feel like the idiot who just spent 70 bucks on somthing that didn't do anything. just my .04 Thats a bummer, I wanted the hp. Link to comment Share on other sites More sharing options...
NoahDL88 Posted October 31, 2005 Share Posted October 31, 2005 Thats a bummer, I wanted the hp. You gotta pay to play Link to comment Share on other sites More sharing options...
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