A 60-1 trim CT-26 is capable of some big gains but there are a LOT of other things which need to be upgraded to support it. Just dropping a bigger turbo in an otherwise completely stock MKIII you won't see more than an extra 50HP, I believe... You'd be able to reach that level of output quicker and hold it longer through the power curve depending on the configuration but without better cooling, better breathing exhaust, more fuel and refined tuning you won't see a lot.
The 50 and 57 trim upgrades tend to be much more reliable stiff have a lot of potential and reportedly spool a bit quicker.
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