i decated my sportif and replaced the cat with a small silencer and broke one of the lambda wires by accident and then i couldnt get it to fit propperly for some reason .. cant remember properly now was a while back but i ended up cutting the lambda wires and leaving it ..... end result idles at 2k at 6 in the morning when its cold(sorry neighbours) randomly had rough/ fluctuating idle. and every now and then mostly after pinning it the check engine light comes on may be a different case on a turbo but id put it in people think im revving my engine when im just sitting at the traffic light waiting to go