Reviewed By Erik S (La Grange, KY) Reviewed for a 2008 Smart Fortwo —4/20/2010 8:18 AM
Wow, I can't believe the big difference a little filter can make. For comparison purpose, I held a new factory filter up to a light, then the K&N filter up to a light. It was a night and day difference; the K&N filter allowed more light to shine through. My driving test, though less scientific, resulted with a feeling of more power. I haven't compared before and after gas mileage yet, but I anticipate improvements with that measurement too.