Dennis Kirk Inc.

2 into 1 High Performance Exhaust System - 1027

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2 into 1 High Performance Exhaust System - 1027

  • Part #:
  • Mfg Part #:
MSRP: $855.00

Price: $769.95 10% off!
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Thunderheader 2 into 1 High Performance Exhaust System - 1027
  • Designed to give maximum horsepower without sacrificing low-end torque
  • 2-into-1 systems with patented collector design that directs spent exhaust gases in a spiral motion through four acoustical damping chambers
  • Exhaust travels through these chambers at high velocity to scavenge spent exhaust gases from the combustion chamber and bring in a fresh charge of air/fuel mixture
  • Anti-reversion design works to impede reverse flow through the system -- reverse flow can contaminate the incoming fuel/air mixture, which reduces performance and throttle response
  • As reverse flow enters the collector, the diffuser deflects it through vents; the pyramidal trap and apertures impede the reverse flow, allowing time for the exhaust valve to close
  • Flow director has equal area at each end, allowing exhaust gases to travel at a constant velocity over the entire length to improve exhaust scavenging


  • For 1986-99 FL models and all 2000-06 models, order 25-1656 for a full coverage set of 3
  • For 1986-99 FX models with forward controls, order the following: H25-033 9" mid rear; H25-037 8" top front; H25-029 13 1/2" collector, H25-039 13 1/2" top rear
    For long style 23" top rear heat shield order, H25-034
    For long style 14" top front heat shield order, H25-035

Included Items:
(1) Header
(2) 5/16-18 x 1-1/4 Hex Bolts
(2) 5/16 in. Plain Washers
(2) 5/16 in. Lock Washers
(2) 5/16 in. Nuts
(2) 3/8-16 x 3/4 in. Hex Bolts
(2) 3/8 in. Plain Washers
(1) Rear Support Bracket

Not all products are legal for sale or use on pollution controlled vehicles. Check your local laws and the manufacturers information

There is no warranty on exhaust pipes and mufflers with regard to any discoloration. Discoloration (bluing) is the result of tuning characteristics, cam timing, carburetor jetting, overheating, etc., and is not caused by defective manufacturing. See the CHEMS/LUBES section for products that will help prevent or remove bluing.

Installation of a new exhaust system may change your motorcycles fuel-air mixture requirements. Please consult the exhaust manufacturer directly with questions regarding any modifications that may need to be made during, or after, installing their product. If a jet kit or fuel processor is recommended, see the FUEL/INTAKE section

The Air Resources Board (ARB) does not permit the use of aftermarket emission-related parts that alter the air/fuel ratio of an emission-controlled vehicle. Due to these legal restrictions this part cannot be shipped to California.

Color Chrome
Finish Chrome
Mfg #: 1027
Part #: H44024
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 19.31 lbs
WARNING: Cancer and Reproductive Harm -
Resources & Manuals
Fitment for Thunderheader 2 into 1 High Performance Exhaust System - 1027

Part H44024 fits the following machines


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