Not heard of any issues with the CEL but I have heard that taking that cat out wrecks the mpg. Now I cant really understand why it would make your MPG go down personally, I thought it would have helped it if anything. Does anyone have any more info on this, I only know of one person who has this mod so I dont have a lot to compare it to lol.
I am enjoying getting 43+mpg out of my R56 and dont want to lose that but must admit that I could always be happier with a bit more grunt when I push the pedal
