Dennis,


This engine is at least 10 years old.
It seems that was a red head.

If it says '6.5' on the side (it is not in focus), it is a normal MVVS .40.

It has a (Macs) tuned pipe, which when adjusted properly, will give you more power boost than the tuned-silencer/mini-pipe.

That tuned-silencer will give you a better response, but with that Four-Star you don't need 3-D like response.
That old, blunt-idle-needle carburettor will hamper adjustability and response, however.