PDS supercharger bugg?

So I put the PDS conversion on the v12 zagato which made no difference to anything except making the car heavier, tried upgrading to race spec and still no changes to stats apart from the car now being lighter than it was without the PDS conversion.

Presume it’s a bug as I don’t see any reason to put something pointless into the game

Edit: just checked telemetry it doesnt put out any boost figures so that probably needs fixing.