Brochure says that the turbo is ceramic coated (guessing the turbine housing; the black part). That's cool.

I still want to get some clarification on the standard vs. polished compressor housing. I was told that the only benefit is appearance, but the polished housing also has anti-surge ports. The non-polished turbo pictured in the brochure does NOT have anti-surge ports. That must have some effect on performance. Not absolute peak power numbers, but it should have some effect on how it builds boost or retains spool under certain conditions that would have some effect on responsiveness.

I actually prefer the looks of the non-polished compressor, but would pay extra for the polished/ported housing if it improves throttle response.