dmandell Posted October 26, 2013 Share Posted October 26, 2013 New member, first post - just purchased a 2013 Impreza w/ 5-speed. Love the vehicle right away, and also love the sound of the boxer engine. Any advice for an aftermarket exhaust kit? I understand there are a variety of choices for the WRX/STI but I was wondering if adding aftermarket exhaust should even be a consideration for my N/A Impreza. I'm also considering a K&N filter. It's cheap and seems to add a bit better gas mileage in my experience with previous vehicles. Thx Quote Link to comment Share on other sites More sharing options...
Bushwick Posted October 27, 2013 Share Posted October 27, 2013 If I were you I'd just cut the muffler out (and swap mid pipe resonator for straight section for a little extra drone) and go with an aftermarket muffler with 2" -2.5" dual outs instead, but shop carefully to avoid a terrible sounding muffler. It's pointless replacing the entire NA exhaust for basically no performance gain and just a different sound, hence a muffler swap. If it were turbo, then I'd say go with a larger down pipe, and 2.5" from cat-back. I used to buy K&N but now just get paper element w/o a metal screen impregnated into the rubber as it's a restriction. Also, the oil from the filter can coat the MAF sensor (if that has one) so be mindful. Quote Link to comment Share on other sites More sharing options...
uniberp Posted October 27, 2013 Share Posted October 27, 2013 As understand k&N filters allow more air because they have bigger pores. Bigger pores mean bigger particles. http://www.bobistheoilguy.com/airfilter/airtest3.htm Quote Link to comment Share on other sites More sharing options...
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