Flowmaster 425404 40 Series Muffler – 2.50″ IN(D)/OUT(D) – Aggressive Sound

40 Series – 2.50 in. IN(D)/OUT(D) – Aggressive Sound; The Original 40 series muffler delivers an aggressive exterior and interior tone. If you’re looking for that original Flowmaster sound this is the muffler is for you. Constructed of 16 gauge aluminized steel and fully MIG welded for maximum durability.;