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Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

  • Part #:
    4407264
  • Manufacturer Part #:
    1031B

MSRP Price: $798.00

Our Price: $718.20

You Save:
$79.80 (10%)
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Overview of Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

  • 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: 25-1725
    23 in. Top Rear: 25-1724
    13-1/2 in. Collector - 25-1723

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

Included items:
(1) Black 2-into-1 head pipe muffler assembly with non removable baffle
(1) Black steel mounting bracket
(1) 5/16 in.-18 x 1 1/4 in. hex head bolt
(4) 5/16 in. flat washers
(3) 5/16

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 sectionin. lock washers
(3) 5/16 in.-18 nuts
(1) Black steel mounting clamp
(2) 5/16 in.-18 x 3/4 in. hex head bolts
Instructions

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 Black 2-into-1 High Performance Exhaust System - 1031B

Color - Primary Black
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.40 lbs

Specs for Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

Color - Primary Black
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.40 lbs

Fitment for Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

See if this part fits your ride

Part 4407264 fits the following machines

Harley-Davidson
  • 2011 Harley-Davidson Dyna Fat Bob - FXDF
  • 2010 Harley-Davidson Dyna Fat Bob - FXDF
  • 2009 Harley-Davidson Dyna Fat Bob - FXDF
  • 2008 Harley-Davidson Dyna Fat Bob (EFI) - FXDF
  • 2009 Harley-Davidson Dyna Low Rider - FXDL
  • 2008 Harley-Davidson Dyna Low Rider (EFI) -FXDL
  • 2007 Harley-Davidson Dyna Low Rider (EFI) -FXDL
  • 2006 Harley-Davidson Dyna Low Rider Injected - FXDL I
  • 2011 Harley-Davidson Dyna Street Bob - FXDB
  • 2010 Harley-Davidson Dyna Street Bob - FXDB
  • 2009 Harley-Davidson Dyna Street Bob - FXDB
  • 2008 Harley-Davidson Dyna Street Bob (EFI) - FXDB
  • 2007 Harley-Davidson Dyna Street Bob (EFI) - FXDB
  • 2010 Harley-Davidson Dyna Super Glide - FXD
  • 2009 Harley-Davidson Dyna Super Glide - FXD
  • 2008 Harley-Davidson Dyna Super Glide (EFI) - FXD
  • 2007 Harley-Davidson Dyna Super Glide (EFI) - FXD
  • 2011 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2010 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2009 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2008 Harley-Davidson Dyna Super Glide Custom (EFI) - FXDC
  • 2007 Harley-Davidson Dyna Super Glide Custom (EFI) - FXDC
  • 2006 Harley-Davidson Dyna Super Glide Custom Injected - FXDC I
  • 2006 Harley-Davidson Dyna Super Glide Injected - FXD I
  • 2011 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2010 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2008 Harley-Davidson Dyna Wide Glide (EFI) - FXDWG
  • 2007 Harley-Davidson Dyna Wide Glide (EFI) - FXDWG
  • 2006 Harley-Davidson Dyna Wide Glide Injected - FXDWG I
  • 2006 Harley-Davidson Street Bob Injected - FXDB I
4.3 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
2
1
1
0
0
Finish
3.2 / 5
Fit
4.5 / 5
Performance
4.8 / 5
Styling
4.0 / 5
Value
3.5 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (1)
No (1)
Finish
4 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Value
5 / 5
Would you recommend this product?
Yes
Love the Thunderheader love the sound and looks fit was tight not hard to install looks great if your looking for pipes Dennis Kirk best price and fast delivery...
May 7, 2017
Purchased
7 months ago
Finish
3 / 5
Performance
5 / 5
Sweet pipe
Great performance and sound. Install is tricky with the c-clamp beside the transmission. Finish is not the best, but let's face it, you don't buy this pipe for looks. Collector shield is a waste of money. Pipe runs very hot!!! Probably gonna end up wrapping it. Scratched the finish installing heat shields.
April 22, 2014
Finish
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Excellent performance
Installed on a 2009 Fat Bob. Exhaust does not come with heat shields. A little tricky maneuvering the pipe into place but not hateful. Get it mocked up loosely before tightening. It is not a loud pipe while cruising. When you start to roll into the throttle it gets throaty, but when you nail the throttle it roars. Got a lot of comments about it. Performance much improved over the Python Staggered Duals it had on it. Rear heat shields is a pain to get on once the pipe is installed. I left it off for now.
September 24, 2014
Finish
1 / 5
Fit
4 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
4 / 5
Styling
3 / 5
Value
2 / 5
Would you recommend this product?
No
fatbob
performance did improve. Does not look good on my fatbob.Ordered it in black finish which came off in my hands during installation.For the extra money that is paid to get black finish I feel it should have been more durable.Ordered chrome heat shields and they do not fit properly or cover pipe were needed most. I would not order this exhaust for a fatbob !
January 12, 2017
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 2 questions Browse 2 questions and 2 answers
Will it fit a 08 fat bob?
A shopper on Oct 3, 2017
BEST ANSWER: yes it does fit
Won't fit 96 dyna?
A shopper on Mar 30, 2017
BEST ANSWER: no

Instructions and Manuals for Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

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