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Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074
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Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

  • Part #: 4405543
  • Manufacturer Part #: 1074
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Overview of Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

  • Increased horsepower, torque and unmistakable Thunderheader sound
  • Furnished with fittings for Oxygen sensors
  • Thunderheader head pipes have been tuned to the proper length and diameter to produce maximum horsepower and an excellent torque curve
  • A patented collector is used instead of a conventional baffle in the muffler
  • The collector is designed to direct spent gases through four acoustical dampening chambers
  • The flow director serves a multi-task function: directs outgoing flow through four acoustical dampening chambers creating a spiral motion upon exiting to atmosphere and it also forms a pyramidal shaped anti-reversion trap to minimize the amount of air rushing in
  • In conjunction with the flow director, a diffuser shroud is built into the reverse cone, this patented device is designed to diffuse the air rushing in as the pressure inside of the system becomes equal to atmosphere
  • Optional heat shields:
    16 in. Top Rear #H25-013
    22 in. Top Front #H25-014
    28 in. Collector #H25-030

Included Items:
(1) Exhaust Header
(2) 5/16 in.-18 x 3/4 in. Hex Bolts
(6) 5/16 in. Plain Washers
(1) 5/16 in. Lock Washer
(1) 5/16 in.-18 Nut
(2) 5/16 in.-18 Lock Nuts
(1) Mounting Bracket
(1) 5/16 in.-18 x 1 1/2 in. Hex Bolt
(1) Clamp 1 3/4 in.
(1) Clamp 2 5/8 in.
(1) Collector 2 5/8 in.
(2) Floorboard Spacers
(1) 3/8 in.-16 x 3 in. Soc Bolt
(2) 3/8 in.-16 x 1 3/4 in. Soc Bolts

NOTE: This is a 2-into-1 standard length (right side only)

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

Specs for Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

Color - Primary Chrome
Finish Chrome
Style - Exhaust Tip Tapered Tip
Type - Exhaust 2-Into-1 System
Units Each
Weight 19.70 lbs

Specs for Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

Color - Primary Chrome
Finish Chrome
Style - Exhaust Tip Tapered Tip
Type - Exhaust 2-Into-1 System
Units Each
Weight 19.70 lbs

Fitment for Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

See if this part fits your ride

Part 4405543 fits the following machines

Harley-Davidson
  • 2013 Harley-Davidson Electra Glide Classic - FLHTC
  • 2012 Harley-Davidson Electra Glide Classic - FLHTC
  • 2011 Harley-Davidson Electra Glide Classic - FLHTC
  • 2010 Harley-Davidson Electra Glide Classic - FLHTC
  • 2016 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2015 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2014 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2013 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2012 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2011 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2010 Harley-Davidson Electra Glide Ultra Classic - FLHTCU
  • 2016 Harley-Davidson Electra Glide Ultra Classic Low - FLHTCUL
  • 2015 Harley-Davidson Electra Glide Ultra Classic Low - FLHTCUL
  • 2016 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2015 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2014 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2013 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2012 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2011 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2010 Harley-Davidson Electra Glide Ultra Limited - FLHTK
  • 2016 Harley-Davidson Electra Glide Ultra Limited Low - FLHTKL
  • 2015 Harley-Davidson Electra Glide Ultra Limited Low - FLHTKL
  • 2016 Harley-Davidson Road Glide - FLTRX
  • 2015 Harley-Davidson Road Glide - FLTRX
  • 2013 Harley-Davidson Road Glide Custom - FLTRX
  • 2012 Harley-Davidson Road Glide Custom - FLTRX
  • 2011 Harley-Davidson Road Glide Custom - FLTRX
  • 2010 Harley-Davidson Road Glide Custom - FLTRX
  • 2016 Harley-Davidson Road Glide Special - FLTRXS
  • 2015 Harley-Davidson Road Glide Special - FLTRXS
  • 2016 Harley-Davidson Road Glide Ultra - FLTRU
  • 2013 Harley-Davidson Road Glide Ultra - FLTRU
  • 2012 Harley-Davidson Road Glide Ultra - FLTRU
  • 2011 Harley-Davidson Road Glide Ultra - FLTRU
  • 2016 Harley-Davidson Road King - FLHR
  • 2015 Harley-Davidson Road King - FLHR
  • 2014 Harley-Davidson Road King - FLHR
  • 2013 Harley-Davidson Road King - FLHR
  • 2012 Harley-Davidson Road King - FLHR
  • 2011 Harley-Davidson Road King - FLHR
  • 2010 Harley-Davidson Road King - FLHR
  • 2013 Harley-Davidson Road King Classic - FLHRC
  • 2012 Harley-Davidson Road King Classic - FLHRC
  • 2011 Harley-Davidson Road King Classic - FLHRC
  • 2010 Harley-Davidson Road King Classic - FLHRC
  • 2016 Harley-Davidson Street Glide - FLHX
  • 2015 Harley-Davidson Street Glide - FLHX
  • 2014 Harley-Davidson Street Glide - FLHX
  • 2013 Harley-Davidson Street Glide - FLHX
  • 2012 Harley-Davidson Street Glide - FLHX
  • 2011 Harley-Davidson Street Glide - FLHX
  • 2010 Harley-Davidson Street Glide - FLHX
  • 2016 Harley-Davidson Street Glide Special - FLHXS
  • 2015 Harley-Davidson Street Glide Special - FLHXS
  • 2014 Harley-Davidson Street Glide Special - FLHXS
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Instructions and Manuals for Thunderheader Racing Products 2-into-1 High Performance Exhaust System - 1074

Instruction Manual Instruction Manual PDF 1.6 MiB

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