Prior to modifying, I had my concerns whether my car would pass if I changed anything. Well, if you feel the same, fear not. I have K&N, 2.5" straight pipe, and APR 91 ECU. My HC's were only 9 PPM out of an allowable 100PPM...pass with flying colors. Just dont tell the Tech. you have the ECU or they will fail you, learned that one the hard way.

 

nice to know