Performance Improvements - On your way to great driving since 1964! Performance Improvements Oshawa is your source for performance auto parts, accessories plus the parts to give great fuel mileage for street, custom, sport compact, tuner, truck, and racing vehicles in Oshawa, Ontario, Canada. If you have a muscle car question, Lonnie Leigh is the man to ask behind the counter. Meet the Manager: Lonnie Leigh Lonnie has been with Performance Improvements for over 30 years and in Oshawa since 1989. Lonnie has been a ¿car guy¿ since he was probably 2 or 3 years old. My mother tells me that I could barely talk, but could name the cars going by on the street! said Lonnie. more... See more text