Thanks to tmg513 - Powick for leading me to INFINITY EXHAUSTS in South Gloucestershire - a couple of miles off Junction 18 - M4 - and a couple of miles from Williams.
Half the price of others and built up from stainless material and fitted whilst you wait.
MX5 Mk 4 done - Roadster will be next.
You retain the original silencer for any subsequent owner.
