Originally Posted by dexx
LOL "no mods.."
never change the exhaust on a modern car with computer controlled ignition without adjusting the timing. Of course _you_ can't adjust the timing! Now the engine is running ignition advance that's way too high for the new exhaust. I bet if you tear down that engine there will be pits all over the pistons and heads from the detonation.
You are a FOOL if you think this engine management, and many others, can't adjust fuel and timing for a simple exhaust mod - catback and 2nd cat delete.