Hi guys

After cleaning my tailpipe, it'll become sooty again after a 10 mile commute/dual carriage way journey driving briskly

Also, it's beginning to backfire more frequently after WOT throttle gear changes - a novelty at first with having the 3" downpipe, but now it's becoming slightly worrying.

I can occasionally see black smoke pulling away from traffic, but I put this down to initial fuelling.

"Sooty" as in chimney dust consistancy, not just normal running.

Anyone else get this ? is it normal on a RICA car to run a bit richer ?

Cheers

Chris