Hi Guys looking for help with my smoking exhaust i have just fitted a decat pipe on my 172 cup and there is smoke coming from the cat to manifold area under the bonnet its as tight as i can get it and im wondering if its leaking exhaust gas or whether it could be the copper grease i have used to protect the new bolts i have used has any one had similar probs or knows what it could be.
thanks in advance
thanks in advance