Just the latest info.
I thought the sports exhaust was a bit loud anyway. So I've reinstalled the original silencer, rear pipe and tail pipe and it's much better. Fumes are only present when booting it, which was normal before the mods. Performance seem as it should be too.
I've also taken the car to the MOT garage and it passes the emission tests with flying colours, so that's a bonus.
Off to the dyno soon.
Cheers
John