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

  • Part #:
    4407264
  • Mfg Part #:
    1031B
1 / 4

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

  • Part #:
    4407264
  • Mfg Part #:
    1031B
MSRP: $845.00

Price: $760.50 10% off!
Make sure this fits your ride
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In Stock - 4 on Hand

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.

Specifications
Part #: 4407264
Mfg #: 1031B
Color Black
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.40 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader Black 2-into-1 High Performance Exhaust System - 1031B

Part 4407264 fits the following machines

Harley-Davidson
  • Dyna Fat Bob - FXDF 2009-2011
  • Dyna Fat Bob (EFI) - FXDF 2008
  • Dyna Low Rider - FXDL 2009
  • Dyna Low Rider (EFI) -FXDL 2007-2008
  • Dyna Low Rider Injected - FXDL I 2006
  • Dyna Street Bob - FXDB 2009-2011
  • Dyna Street Bob (EFI) - FXDB 2007-2008
  • Dyna Super Glide - FXD 2009-2010
  • Dyna Super Glide (EFI) - FXD 2007-2008
  • Dyna Super Glide Custom - FXDC 2009-2011
  • Dyna Super Glide Custom (EFI) - FXDC 2007-2008
  • Dyna Super Glide Custom Injected - FXDC I 2006
  • Dyna Super Glide Injected - FXD I 2006
  • Dyna Wide Glide - FXDWG 2010-2011
  • Dyna Wide Glide (EFI) - FXDWG 2007-2008
  • Dyna Wide Glide Injected - FXDWG I 2006
  • Street Bob Injected - FXDB I 2006

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Reviews & Questions
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Browse 6 questions Browse 6 questions and 7 answers
Won't fit 96 dyna?
A shopper on Mar 30, 2017
BEST ANSWER: no
Will this fit a 2011 fxdwg? A Dyna wide glide
A shopper on May 7, 2018
BEST ANSWER: That's what i put on my 96inch 2010 streetbob. I'd say yes, love mine
Should you replace exhaust gaskets when changing exhaust?
A shopper on May 25, 2020
BEST ANSWER: Yes
Does this fit with forward controls 2010 fxdb?
Shane O on May 19, 2019
BEST ANSWER: I installed this exhaust on a 2010 FXD with forward controls and it fit fine. Have since installed floorboards that just barely fit. I believe FXD & FXDB use the same frame.
Does this come with heat shield's, or do you have to buy them separately?
Anthony A on May 23, 2018
BEST ANSWER: 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
Will it fit a 08 fat bob?
A shopper on Oct 3, 2017
BEST ANSWER: yes it does fit
4.3 / 5.0
8 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
4
2
2
0
0
Finish
3.6 / 5
Fit
4.7 / 5
Performance
4.8 / 5
Styling
4.5 / 5
Value
4.2 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (5)
No (1)
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
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
Kansas City , MO
Purchased
over 3 years ago
Ride:
Fxdb
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
5 / 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
Great pipe, ran one on my Evo, want one for my Shovelhead
Dyna FXDB with Thunderheader, Progressive suspension and Villain2 Hero bags
Dyna FXDB with Thunderheader, Progressive suspension and Villain2 Hero bags
November 1, 2019
Willis , TX
Purchased
10 months ago
Ride:
07 Dyna FXDB
Finish
4 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Value
4 / 5
Would you recommend this product?
Yes
T-Header is the only way to go, so go with Dennis Kirk.
Great pipe very well made, incredible sound! The customer service with my order was outstanding. The only issue I had were I wish the coating on the pipe was a little more durable, I happened to scuff it putting the exhaust flanges on. Other than that it was an easy swap and an awesome finished product. Thank you Dennis Kirk, you have earned my business for future purchases.
Looks Sharp & Sounds Better!
Looks Sharp & Sounds Better!
May 13, 2018
Purchased
over 2 years ago
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
Finish
2 / 5
Fit
4 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
4 / 5
Styling
4 / 5
Value
4 / 5
Would you recommend this product?
Yes
Nice but....
These pipes sound good, the performance is good but the finish is terrible. They already started peeling paint after only 50 miles. For the money they are ok but don't compare to D&D
June 4, 2018
Purchased
over 2 years ago
Finish
5 / 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 it.
July 29, 2018
Purchased
over 2 years ago