Flowmaster 40 Series 2.5" Dual In 3" Center Out Aggressive Chambered Muffler 2003-2007 Ford F-550 6.0L (3) M6 x 1

(3) M6 x 1

Dual aluminum mufflers Black Coated

Eliminates common hot start and weak start-up problems

Designed for modern F-150 platforms

Flowmaster 40 Series 2.5" Dual In 3" Center Out Aggressive Chambered Muffler 2003-2007 Ford F-550 6.0L (3) M6 x 1The 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. Features: Noticeable interior resonance No internal packing to blowout Aggressive Sound Exterior Exhaust Tone Excellent Street Strip and Off Road application Durable fully welded 16 gauge aluminized