The old JBS tubular manifold wasnt built by ourselves and we have seen a number of them crack,although we no longer deal with that company.
We are currently looking into a cast manifold that will be capable of supporting upto 300bhp.
The equal length manifolds for the K03 and K04 turbos are next to impossible to design and develop,we have already been down this route with a number of manifolds and they caused no end of headaches for us.
Leigh