I am building a Haynes Roadster and am going to be modding my manifold and making up an exhaust system but before I spend hours doing it....

Does anyone have a 4 into one bonnet exit exhaust manifold for 1.6 MX5 (or one that could be adapted)?

An in - line weld - in CAT?

And a silencer, large, I want to pass the 99db test with ease?

Ian