Hey everyone, haven't been on for a while. I decided it was time to start tuning my R55, since I decided to keep it. So within the last month, I have installed a K&N intake (which i MIGHT CHANGE), replaced all the intake hoses with M7 hoses. I installed a bigger intercooler. And I also got a walnut blast on the intakes. The latest install was the Hi flow downpipe from Scorpion. Everything was fine until the downpipe was installed. I started getting engine Malfunction light and I could feel the reduction. We put a computer on it and got multiple codes. But the physical change we did is install a OEM diverter valve. Needless to say that didn't fix the problem, because as soon as I punched it, the light came on. I plan on getting a dyno tune from Bren tuning. But in the meantime I would like to clear this up first. any suggestions?

 

Pull the codes so we can help. I’m sure p0420 is going to be one of them, this one shouldn’t effect things to bad.

 

No Cat + No Tune = Engine Light