The muffler that started it all, the original 40 Series Muffler is an aggressive sounding street/strip muffler that delivers a powerful “Flowmaster Sound” you’ve heard so much about it. If you really want to hear your exhaust system and that great muscle car tone – from both inside and out of the vehicle – the 40 Series is for you.
The original high performance Flowmaster muffler
Aggressive sound for the enthusiast you likes their exhaust LOUD
Available in either aluminized steel or 409S Stainless
Stainless steel mufflers covered by limited lifetime warranty
Fully MIG welded for durability
ORIGINAL 40 SERIES 19.00" OAL X 13.00" CASE X 9.75" WIDE X 4.00" THICK