Quote Originally Posted by nissan_doctor View Post
and the same is true of welding up the internal waste gate.
Quote Originally Posted by tweek View Post
whats wrong with welding up the internal wastegate and using a manifold with an external wastegate (one that has been purchased not home made)
As above, Turbo's, as with manifolds, are all about flow design and if you just block off an outlet you will cause turbulance and back pressure within the turbo and also within the turbo elbo there will be a low pressure area where the wastegate should be opening.

I'm not saying that doing it will make the engine blow up instantly but engines are basically a pump which works solely on perfect flow and cutting holes and welding up bits of the turbo which were designed to work one way is going to reduce the smooth flow throught the exhaust system.