[andy2]

Is that a single scroll turbine housing/manifold? If so why is it better than a twin scroll? I like how the exhaust manifold flows! Perhaps in your application you are concerned about compressor surge like a twin scroll setup might be more prone to having with the same turbine flow as a single scroll?

Also is your manifold able to retain the heat as compared to a cast manifold for example?

I'm trying to decide between single and twin scroll manifold/turbine housing setups for my 1.9L tdi project and would greatly value your input on this.