Thank you for your replies, but I have a more pressing problem at the moment. I have had a branch and free flow fitted to my vehicle that is playing havoc with its performance.It is behaving worse than std. They have run 50mm to the first silencer which is 57mm and continue with 57 through the rear silencer to a 50mm tailpiece???
I have not had the car dino tuned or re-jetted as I am doing a 36dcd conversion on it tomorrow...do I suspect the freeflow or does the carb need to be re-jetted (I owned a 1981 1400 van that ran a Wildcat system where no changes were necessary. I just want to clarify things before I do the carb conversion and hide an underlying problem. Any ideas