40 Series - 2.50" IN(D)/OUT(D) - Aggressive Sound black Its thicker shoulder straps provide

Its thicker shoulder straps provide additional support and durability

5L EcoBoost exhaust Manifolds

Measured Flow: 275 CFM @ 7" H2O

The patented air filter to housing interface allows for maximum filter size which increases the available air volume while simplifying the installation process

Thread-In Soft Plugs - Eliminates failure-prone factory soft plugs for enhanced longevity

40 Series - 2.50" IN(D)/OUT(D) - Aggressive Sound black Its thicker shoulder straps provideThe 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.