Plenty of threads on this - and horror stories.
Imo, lpg mappers have no skills with performance cars.
I have had my Cupra R converted onto LPG and 40k later it is still going strong
My car has high performance injectors and a larger diameter gas pipe going from the tank and a super regulator. Car goes all the way up to the readline no problems at all.
I have seen some pretty rapid cars, like a BMW M5 and a V8 Merc that have been converted too, all run fine. Just need to get it done from someone who knows what they are doing!
I know two people who drive an LPG converted Octavia VRS and Leon Cupra, once again with no problems at all.
Go ahead and do it BEOWULF