What is the next size down from .63? I'm worried that my engine will blow a piston again because of boost spike, I don't care about the lag because I like it but even with a rr setup and running omex 600 is there still a chance it will happen again?

I was also looking at the t3 upgrade thing on ebay that gives you:
A/R 60 Compressor housing
Backplate (T04B Style)
T34 Compressor Wheel

Is this worth buying?

Thanks Joe