I think the part no is 33-2974 for K&N replacement filter. Though you might want to do an online search to confirm the same. You could fit the same on your own, but you might need a couple of spanners and screw drivers to remove the bolts and screw on the air filter box. Or you could get it installed from a local mechanic, he would certainly have all the tools required for this job. Please ensure you wipe off the dust in the filter box with a damp cloth and later with a dry cloth before you place your K&N filter. Replacing Filter does not change anything in the ECU. The ECU just senses that with pressure on accelator, more air is flowing in due to which fuel flow would also increase which in turn increases your rpm and your low end torque. It would not affect the funtioning of the ECU in any manner. Just remember to appraise the ASS to not remove the filter or blow dry it else they might just replace the same with the normal one or damage the existing one (a costly mistake).