The American Thunder 40 Series is the most aggressive sounding street and strip muffler in Flowmaster's product line. The 40 Series will generate extreme interior resonance within the vehicle. If you want to really hear your exhaust system inside as well as outside your vehicle the 40 Series is for you.
The Flowmaster 40 Series two chamber muffler is the original bad boy for street/strip cars. Made of 16 gauge, aluminized steel, the unique design cancels out noise, but makes big power.
Overall measurement is 19" long, 9-3/4" wide and 4" thick. Body alone is 13" long.
40 Series Muffler, 2.25" IN (O) / OUT (C): ea