Hey, So my car (2012 Subaru WRX Limited Hatch) has been running fine no issues, until i installled a turbo XS 3" exhaust With catted down pipe. my car is now showing P0018 code for Cam misalignment. I find this strange as the car ran fine before. The car is tuned to Stage 2+SFACN91 with a cobb accessport. I have a Cobb SF intake, Cobb Turbo inlet, Grimspeed AOS, lightweight pully, cobb Recirculating valve, and the before mentioned Turbo XS 3" exhaust. I am getting between 1-3 misfire on cyl 1 and 2 shown on access port, only at idle. I bought the car at 59,000 miles, and i now have 94,000 miles. I have not changed the spark plugs, so i am going to to try that, though i dont know that that will solve the issue, as the car ran fine before with out the exhaust. I have reflashed the ECU, set it to stock, stage one and stage 2 with same result. Has anyone had a similar issue?