ok so my daily driver is a 1990 silverado running the stock 305 with 160,000 kms on it. i drove the truck to school every day and just recently decided to modify the exhaust. i installed a cat back exhaust with a flowmaster 40 series muffler, mandrel bent tail pipes and stainless tips. it has a nice tone to it now but i dont think its to loud cause i kept the stock cat. so this brings me to the subject. The other day i was minding my own business driving through town and i looked in my mirror and saw some flashing lights. i pulled over and and the cop gets out and asks me what kind of muffler i was running. then he tries to tell me that the 40 series is a improper muffler and i could get fined like $300. anyway he let me off with a warning. i have talked to different people and they all tell me it isnt illegal in anyway in ontario. i just wondered if anybody else has had this problem and if the flowmaster 40 series muffler is illegal?