American Prime MFG APM-3041-0502 Mikuni HSR42 Total Kit for Evolution Big Twin 84-99Mikuni HSR Total Kit 42 8 for 1984 thru 1999 Harley Davidson Evo Big Twin Models. Mikunis HSR Total Kit dramatically improves the performance on all Harley Davidson engines and delivers unmatched throttle response and acceleration! With this kit even more improvement is delivered by both this specially designed Mikuni manifold and this high flow matched K&N air cleaner. For the maximum available increase in all round performance and power available,