I have a 2012 NAV with 75,000km. I've been running the Megan cat-back exhaust for almost 2 years now (30,000-40,000km). I preform injector flushes every 25,000km, combustion chamber cleaning and the recommended fuel aditive every 5,000-10,000km (aditive is recommended every 12,000km). I also have been running 91 octane since I bought the car with quaker state synthetic 5w-20 motor oil (except for the last oil change which was Mobile One synthetic 5w-30, which is allowed based on the manual) oil changes every 5,000km with an OEM filter.
Recently as I was driving my car it stalled. The catalytic converter was so plugged up that the car could not run at all (No codes). Got the catalytic converter replaced and they said it was due to carbon build up caused by the lack of backflow from the A/M exhaust. I think its total horse **** as that's not how the GDI system works. It reads the intake of air and mixes in the appropriate level of fuel. Now that I have gotten my car back there's a ticking/knocking noise from the engine that makes it sound like a diesel (No it isn't the high pressure fuel pump. Way to loud for that).
My question to you guys is has anyone experienced similar issues? Especially those with aftermarket exhausts. Any mechanics out there to verify what they have told me about the carbon build up and the issues the A/M exhaust is causing me?
Recently as I was driving my car it stalled. The catalytic converter was so plugged up that the car could not run at all (No codes). Got the catalytic converter replaced and they said it was due to carbon build up caused by the lack of backflow from the A/M exhaust. I think its total horse **** as that's not how the GDI system works. It reads the intake of air and mixes in the appropriate level of fuel. Now that I have gotten my car back there's a ticking/knocking noise from the engine that makes it sound like a diesel (No it isn't the high pressure fuel pump. Way to loud for that).
My question to you guys is has anyone experienced similar issues? Especially those with aftermarket exhausts. Any mechanics out there to verify what they have told me about the carbon build up and the issues the A/M exhaust is causing me?