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Thunderheader 2 into 1 High Performance Exhaust System - 1035

  • Part #: 4406474
  • Manufacturer Part #: 1035

MSRP Price: $730.00

Our Price: $596.88

You Save:
$133.12 (18%)
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Overview of Thunderheader 2 into 1 High Performance Exhaust System - 1035

  • 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 dampening 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 heat shields, order the following:
    14 in. Top Front - H25-035
    23 in. Top Rear: H25-034
    13-1/2 in. Collector - H25-029

Included Items:
(1) Exhaust header
(1) 5/16-18 x 1-1/4 in. Hex bolt
(4) 5/16 in. Plain washers
(3) 5/16 in. Lock washers
(3) 5/16-18 Nuts
(1) 1-3/4 in. Clamp
(2) 5/16-18 x 3/4 in. Hex bolts
(1) Mounting bracket

For the best performance, A free-flowing air cleaner and adjustable fuel management system is recommended with this pipe.

Fits models listed with center and forward controls

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.

Specs for Thunderheader 2 into 1 High Performance Exhaust System - 1035

Color - Primary Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.45 lbs

Specs for Thunderheader 2 into 1 High Performance Exhaust System - 1035

Color - Primary Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.45 lbs

Fitment for Thunderheader 2 into 1 High Performance Exhaust System - 1035

See if this part fits your ride

Part 4406474 fits the following machines

Harley-Davidson
  • 2017 Harley-Davidson Dyna Fat Bob - FXDF
  • 2016 Harley-Davidson Dyna Fat Bob - FXDF
  • 2015 Harley-Davidson Dyna Fat Bob - FXDF
  • 2014 Harley-Davidson Dyna Fat Bob - FXDF
  • 2013 Harley-Davidson Dyna Fat Bob - FXDF
  • 2012 Harley-Davidson Dyna Fat Bob - FXDF
  • 2017 Harley-Davidson Dyna Low Rider - FXDL
  • 2016 Harley-Davidson Dyna Low Rider - FXDL
  • 2015 Harley-Davidson Dyna Low Rider - FXDL
  • 2014 Harley-Davidson Dyna Low Rider - FXDL
  • 2016 Harley-Davidson Dyna Street Bob - FXDB
  • 2015 Harley-Davidson Dyna Street Bob - FXDB
  • 2014 Harley-Davidson Dyna Street Bob - FXDB
  • 2013 Harley-Davidson Dyna Street Bob - FXDB
  • 2012 Harley-Davidson Dyna Street Bob - FXDB
  • 2014 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2013 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2012 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2017 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2016 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2015 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2014 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2013 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2012 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2017 Harley-Davidson Low Rider S - FXDLS
  • 2016 Harley-Davidson Low Rider S - FXDLS
1.0 / 5.0
1 Review
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
0
0
0
0
1
Finish
1.0 / 5
Fit
5.0 / 5
Performance
5.0 / 5
Styling
5.0 / 5
Value
2.0 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (1)
Finish
1 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Value
2 / 5
Would you recommend this product?
Yes
Rust is not good.
If I could put -5 stars I would. This thunderheader was in terrible condition. Must have been sitting in Dennis Kirk's warehouse for years. Rust coming through the chrome at the joint. And the inside of the pipe had rust. Pretty disappointing.
October 22, 2016
Purchased
4 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 3 questions Browse 3 questions and 10 answers
Does the system come with heat shields?
A shopper on Sep 12, 2016
BEST ANSWER: No, you purchase them separately. Love the look and functionality of the shields
Where can I get thunder header to fit 08 roadking?
A shopper on Nov 22, 2016
BEST ANSWER: Here is a link to the Thunderheader products we carry for a 2008

RoadKing:https://www.denniskirk.com/thunderheader-racing-products
Is the right side ground clearance affected by the pipe? In the picture it appears very low to the ground.
David D on Nov 22, 2016
BEST ANSWER: Should be no ground clearance issues, simply just the way the exhaust is pictured in the image, it appears to be quite low.

Instructions and Manuals for Thunderheader 2 into 1 High Performance Exhaust System - 1035