Sorry for the newbie type question but I put a k&n drop in style filter in my 06 WRX and installed a SPT cat back exhuast a while back. Should I have reset my ECU or with these simple mods does it not matter? If a reset should have been done should I do it now. I've been driving with the filter for about 1500 miles and the exhuast for about 200 miles. I figured I didn't need to reset the ECU since these mods don't do a whole lot but I've been reading lately that the ECU should be reset with any little change. Thanks