sure it's not over fuelling or got misfire?
I had it on a dyno the other day, and as he was prepping the car etc you could smell it... looked under the bonnet and you could see it glowing... but even if it isn't be a nice little mod to do... thanks for the link, has anyone else fitted this one? or do i spend a little more and get a branded type?
didn't they probe the exhaust?