[Euro Ford Fan]

Chris is right external wastegates are really only needed on high boost setups or on cars with limited space. I've run up to 28PSI on an internal wastegate with no creep but that was on a new turbo and wastegate. If you’re running boost on a motor that’s near it's limit any creep or a failure would most likely lead to a catastrophic failure. I've spiked over 30psi but my motor won't fail from a few hits of really bad detonation.

I know they say that internal wastegates lead to slower spool but I've never noticed that much of a difference in spool time. I can still make full boost at the moment 28PSI at 3200RPM which is more than I need on my setup. I will be changing to an external wastegate this spring a 46mm Tial but that's only because the header I'm going to use only comes with an external setup.

In the end it comes down to what you want for boost response, max power size of turbo etc.

I just ordered my new turbo for my street XR a T3/T4 with a 52trim compressor and .63 A/R hot side. It will push me towards 300HP without any head work and I'll still run an internal setup. I should hit full boost 20psi at about 3200 -3400RPM which is fine. If I was building a turbo focus I would be looking at a much smaller something like a GT28 which would produce fantastic boost response and still make 260-280ish HP.