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The muffler that started it all, the original 40 Series Muffler is an aggressive sounding street/strip muffler that delivers the powerful Flowmaster Sound You have heard so much about. If you really want to hear your exhaust system and that great muscle car tone from both inside and outside of the vehicle - the 40 Series is for you 40 Series Muffler;409S Stainless Steel; California Residents: WARNING
