Flowmaster 40 Series Muffler 2.5 inch V8.
This is the original Flowmaster sound with a powerful aggressive tone and noticeable interior resonance varies with RPM.
40 Series Performance Street & Strip, 4'' x 9-3/4'' Case In/Out: 2-1/2'' Body: 13'' Chambers: 2 OFFSET IN, CENTER OUT Applications: | 
\ 
