i can not comment on other products on the market, but i have been constantly logging my RS3 and it runs spot on, the logs are showing no different from my stage 2 tune on a stock turbocharger.
We are always looking at ways to improve our hybrid we are now running 500ps @ 1.8bar which is not flat out, we have also improved a bit more and results will be in next week.
and lets be honest 600hp reliable, stage 1 tunes have had pistons let go.
Ben