welded wastegate help

[anto]

Could possibly use the existing egr exhaust port to form an external wastegate.
More hassle than it is worth though.

problem with this is it would causse massive turbulance in the manifold, as gases would have to reverse direction and flow up the downpipe with the EGR in it.. its difficult to retrofit,

If using an egr manifold there will already be turbulence caused by that port anyway. Using it as a wastegate isn't going to make much difference except to allow boost control. The pro's outweigh the con's IMO.

I realise it isn't ideal though....