The codes I'm currently reading off of a generic OBD2 code reader at a local Advance Auto. First code is a P0420. I knew I would be getting this one because of the mods that have been done to the car. Mods are Drop in K&N air filter in the OEM air box, a Megan Racing 2.5 in DP with no cat, and a SRS 2.5 in cat back exhaust. The MAF is a brand new Bosch. The second and more concerning code is a P1296. The only thing I came up with so far is it being coolant related. I was told that more than likely it is the coolant temp sensor but wanted to double check. I cleared the codes and so far neither of them have returned after about 20 miles of driving.