Originally Posted by risco
If the exhaust housing big is enough you shouldnt need a waste gate.
If the exhaust housing is smaller, then you could install a blow off valve to eliminate turbo surging, but that won't help with the drive pressures. If you are worried about drive pressure or plan to run nitrous a wastegate is the way to go. You can make your own custom up pip to run the external gate. I have seen some cool setups like that. One that I though was a good idea was to use the factory up-pipe, and plumb the wastegate in where the EGR was. That minimizes the amount of fab work that is needed.
If I were you, I would say run it as is for now, and monitor your backpressure and wwatch for surging. If you think you need a wastegate, you may be better off to purchase an internally gated exhaust housing for your turbo.