It doesn't have a limited coil, I've never had a problem with the stock
carb pumping enough fuel after a muffler job. Just pull the limiter cap on the high needle
and bump it out a 1/8-1/4 usually richens it up enough.
A muffler mod, or anything that increases the air velocity through the carb, will make your mixture richer. The L may need to be enriched to provide better acceleration/throttle response.