The Challenger 2 LEP uses the CV12-6A/9A (depends on pure opinion) not the MTU.
Acording to gaijin it is the CV12-6A so it should be using the same engine sound as the other Challenger 2s.
And if someone starts yapping the 9A is different. It’s not. It’s a CV12-6A with an improved cooling system.
Edit: It should also have the same HP as the base Challenger 2.
LINK TO BUG REPORT POST (LETS TRY AND GET THE DEVS ATTENTION ON IT): Community Bug Reporting System