I tried the kit out in Malaga and the Ego i was using at the time chrono'ed at approx 290fps with 0.68cal paint. Having installed the 0.50cal kit i shot some 0.50cal paint (without making any adjustments to the inline) and it chrono'ed approx 100fps higher, so you will need to lower the output pressure of your Inline regulator to compensate.
Nicky T