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DYNOMAX 39321 Specifications
Bend TypeMandrel
Body FinishNatural
Clamp Count8
Clamp TypeBand
Dimensions - Body Length14 in.
Dimensions - Pipe Diameter2.5 In.
Exit LocationRear
Grade TypePerformance
Inlet Quantity1
Kit ContentsIntermediate Pipe, Muffler, Extention Pipes, Tail Pipes, Tips, Clamps, Hangers, Bolt Kit
Mounting Hardware IncludedYes
Muffler FinishBare
Muffler MaterialStainless Steel
Muffler Quantity1
Muffler Type IncludedUltra Flo Welded
Outlet Quantity2
Oxygen Sensor Bung IncludedNo
Pipe FinishNatural
Pipe MaterialStainless Steel
Single or DualDual
System StyleCat Back
Tip CutAngle
Tip Edge StyleRolled
Tip FinishPolished
Tip MaterialStainless Steel
Tip Outlet Size3
Tip Quantity2
Tip ShapeRound
Ultra Flo Welded Dual System

Give your Ford F-150 or F-250's exhaust system an upgrade with a DynoMax® Ultra Flo® welded 2.5-in. dual cat-back exhaust system. Features a DynoMax Ultra Flo welded muffler that features Continuous Roving Fiberglass (CRF) to absorb unwanted interior resonance while maintaining a deep performance tone.


Features & Benefits:
  • COMPATIBILITY | Designed for 1999-2004 Ford F-150 and 1997-1999 Ford F-250; 120-in., 139-in. and 157-in. wheelbases; see product information for compatibility and engine specs
  • COMPLETE SOLUTION | Includes DynoMax Ultra Flo welded muffler, pipes, tips, hangers, clamps, bolts and cable ties
  • EASY TO INSTALL | Direct-fit bolt-on pre-assembled solution with welded hangers, pipes and clamps for easy installation that doesn't require specialized fabrication and/or welding
  • IMPROVED FLOW CAPACITY | 2.5-in. Stainless-steel tubing with mandrel bends improves flow capacity over traditional bends while increased pipe diameter from OE sizes increases flow and power
  • SUPERIOR PERFORMANCE | Straight-through design ensures unrestricted exhaust flow and reduces back pressure; dyno proven to flow up to 1,900 SCFM
  • PREMIUM ACOUSTIC CONTROL | Exclusive Continuous Roving Fiberglass (CRF) technology absorbs unwanted interior resonance while maintaining a deep performance tone
  • ENGINEERED TO LAST | Stainless-steel construction with a micro-finish for lifelong protection and 100% welded design for maximum durability
  • NOTES | Exits in rear on either side of license plate; under 8,500-lb. GVWR with dual exhaust; 3-in. outlet double wall, buffed and polished stainless-steel slant cut tips
  • BUY WITH CONFIDENCE | Comes with DynoMax's limited lifetime warranty and exclusive 90-Day Performance & Sound Guarantee
Hear It Logo

For the best results DynoMax highly recommends using a good set of headphones or better than built-in computer speakers. Muffler sound is all about BASS. Cell phones and built-in computer speakers will not give you the true experience of the Muffler sound.


Super Turbo Ultra Flo Polished
Super Turbo Muffler Ultra Flo SS Muffler
❚❚❚❚❚❚❚❚❚❚
Mild
Sound Level
❚❚❚❚❚❚❚❚❚❚
Moderate
Sound Level
Ultra Flo Welded Race Bullet
 Ultra Flo Welded Muffler Race Bullet Muffler
❚❚❚❚❚❚❚❚❚❚
Aggressive
Sound Level
❚❚❚❚❚❚❚❚❚❚
Very Aggressive
Sound Level

*Sound clips generated from a 2010 Chevy Camaro SS on a cat-back system with 2.5" diameter pipes and 2.5" DynoMax mufflers.
Benefits of Purchasing an Exhaust System Kit

Replacing just a section of your exhaust system is less expensive up-front, but a complete Exhaust System Kit provides added benefits:

  • Extend Service Life: New clamps, gaskets and hangers (where applicable) prevent exhaust system leaks or damage that can occur when reusing old / incompatible hardware.
  • Reduce Install Time: All included parts are guaranteed to fit together seamlessly to ensure a smooth, problem-free installation.
  • Save Money: The cost of the complete kit is often less expensive than buying the components individually, and means you only have to do the job once.
90-Day Risk-Free Trial Offer

Try DynoMax premium exhaust products for 90 days*. If, for any reason, the qualifying products don't live up to your expectations during the trial period, replace the products and DynoMax will refund the original product's purchase price, plus labor (up to $50 per exhaust system).

SAFE & SOUND® GUARANTEE
90-Day, Risk-Free Trial Offer
Limited Lifetime Warranty

Learn More
SAFE & SOUND®
GUARANTEE

* Email warranty@driv.com with the original purchase receipt to claim offer. Offer limited to purchase of one (1) DynoMax VT Muffler, Ultra Flo SS Polished Muffler, Ultra Flo Welded Muffler, Super Turbo Muffler, or Stainless Steel Cat-Back System. This offer does not include units improperly installed or substituted. Valid only on vehicles used for private, non-commercial use and may be withdrawn at any time.

Additional Resources

Installation Instructions

Warranty Information:
Muffler: Limited Lifetime. Pipes, Resonators & Straps: No Warranty
Warranty Details