for air filter review, check this out:
http://www.mikekemper.com/elantra/filters/
HKS filter element seems not effective on dirt. I'm using apexi open port, only can feel the diff during night time, day time not much diff. I also used HKS drop in for another car, nothing diff from stock, the only good point is washable & no need to reoil, safe $$$ hehe...
http://www.mikekemper.com/elantra/filters/
HKS filter element seems not effective on dirt. I'm using apexi open port, only can feel the diff during night time, day time not much diff. I also used HKS drop in for another car, nothing diff from stock, the only good point is washable & no need to reoil, safe $$$ hehe...