I personally haven't used any of them, but audiworld.com recommends:
Eurotech in Etobicoke (416) 255-3376, ask for Jamie
Tecbo Motors in Markham (905) 887-9997, ask for Peter
GT Performance in Woodbridge (905) 850-0112, ask for Joe
VIN TEST (416) 638-9558, ask for Atila
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