Need more info. My Carrera T might like this for Christmas.

Currently working on a Ducktail for 991.2. Need a spare wing lifting mechanism for testing (part # 99150404124).

Generally speaking it depends on how often you exceed the power demands you made before the mod was made. In "normal" conditions change should be minimal at most. Unless you spend a fair amount of time at full throttle I wouldn't expect much change.