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Thunderheader 2 into 1 High Performance Exhaust System - 1026

  • Part #:
    H44023
  • Manufacturer Part #:
    1026

MSRP Price: $703.00

Our Price: $574.88

You Save:
$128.12 (18%)
10 on Hand

Overview of Thunderheader 2 into 1 High Performance Exhaust System - 1026

  • 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 heat shields, order the following: H25035, 14 in. long style top front; H25034, 23 in. long style top rear; H25029, 13-1/2 in. collector

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 1 in. Hex bolts
(1) Mounting 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.

Specs for Thunderheader 2 into 1 High Performance Exhaust System - 1026

Color - Primary Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.06 lbs

Specs for Thunderheader 2 into 1 High Performance Exhaust System - 1026

Color - Primary Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 22.06 lbs

Fitment for Thunderheader 2 into 1 High Performance Exhaust System - 1026

See if this part fits your ride

Part H44023 fits the following machines

Harley-Davidson
  • 2000 Harley-Davidson Dyna Convertible - FXDS-CONV
  • 1999 Harley-Davidson Dyna Convertible - FXDS-CONV
  • 2005 Harley-Davidson Dyna Low Rider - FXDL
  • 2004 Harley-Davidson Dyna Low Rider - FXDL
  • 2003 Harley-Davidson Dyna Low Rider - FXDL
  • 2002 Harley-Davidson Dyna Low Rider - FXDL
  • 2001 Harley-Davidson Dyna Low Rider - FXDL
  • 2000 Harley-Davidson Dyna Low Rider - FXDL
  • 1999 Harley-Davidson Dyna Low Rider - FXDL
  • 2005 Harley-Davidson Dyna Low Rider Injected - FXDL I
  • 2004 Harley-Davidson Dyna Low Rider Injected - FXDL I
  • 2005 Harley-Davidson Dyna Super Glide - FXD
  • 2004 Harley-Davidson Dyna Super Glide - FXD
  • 2003 Harley-Davidson Dyna Super Glide - FXD
  • 2002 Harley-Davidson Dyna Super Glide - FXD
  • 2001 Harley-Davidson Dyna Super Glide - FXD
  • 2000 Harley-Davidson Dyna Super Glide - FXD
  • 1999 Harley-Davidson Dyna Super Glide - FXD
  • 2005 Harley-Davidson Dyna Super Glide Custom - FXDC
  • 2005 Harley-Davidson Dyna Super Glide Custom Injected - FXDC I
  • 2005 Harley-Davidson Dyna Super Glide Injected - FXD I
  • 2004 Harley-Davidson Dyna Super Glide Injected - FXD I
  • 2005 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2004 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2003 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2002 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2001 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2000 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 1999 Harley-Davidson Dyna Super Glide Sport - FXDX
  • 2005 Harley-Davidson Dyna Super Glide Sport Injected - FXDX I
  • 2004 Harley-Davidson Dyna Super Glide Sport Injected - FXDX I
  • 2003 Harley-Davidson Dyna Super Glide T-Sport - FXDXT
  • 2002 Harley-Davidson Dyna Super Glide T-Sport - FXDXT
  • 2001 Harley-Davidson Dyna Super Glide T-Sport - FXDXT
  • 2005 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2004 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2003 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2002 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2001 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2000 Harley-Davidson Dyna Wide Glide - FXDWG
  • 1999 Harley-Davidson Dyna Wide Glide - FXDWG
  • 2005 Harley-Davidson Dyna Wide Glide Injected - FXDWG I
  • 2004 Harley-Davidson Dyna Wide Glide Injected - FXDWG I
4.3 / 5.0
14 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
8
4
1
0
1
Finish
4.5 / 5
Fit
5.0 / 5
Performance
4.9 / 5
Styling
4.0 / 5
Value
4.0 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (2)
Finish
4 / 5
Performance
5 / 5
instant horsepower
best addition to my motor yet..horsepower increase you can feel in the seat of your pants ...product was expertly packaged and arrived in perfect condition .....
January 18, 2011
Finish
4 / 5
Performance
5 / 5
No Review Title Entered By User
Need longer bolts to mount bracket to transmission
Tight fit between pipe and foot-board - slotted hole would be helpful
January 19, 2011
Finish
5 / 5
Performance
5 / 5
The right pipe-apology long review
The right sound, easy to install, 10HP, 20FtLbs Torque bolt-on. Get the shield kit or cook your leg.
Yes it's a bit louder than VH duals. But a deeper, respectful, commanding duntDunt. Not the obnoxious blatBlat from the BigRadius 2-1.
So I got a free Dynotune from a dealer, who dyno'd it the next week with only this $650 mod (with shields). From 94HP/104# torque to 104hp/124#torque.
Provides the performance I needed from stock on my '09 FXDFSE. Dynotune is a must from stock-it turned my skoot to a monster.
Buy 2 rear tires, cause they won't last.
Comes with O2 ports, perfect fitment, mounting bracket and all you need minus the head port gasket (why not? -it's right there and $5 pair).
25 mins to install, no fancy tools except a swivel socket extension. And ale-pale Ale.
January 28, 2014
Finish
5 / 5
Performance
5 / 5
Great addition
I recently purchased a 2001 Dyna Low rider with 7000 miles from a great previous owner that did very little to the bike but maintain it. He did put a Mikuni carb on it. My plan was to do the bike up right and quick..two weeks...but tasteful. I added the intake and cleaner and quite a few other items to dress the bike up to my style. Most importantly I waited until last to do the exhaust, so I called Mikuni and talked to Steve...told him what I was doing and asked for his advice. Afterwards, given my style I was going for and the performance I was seeking, he offered the Thunderheader as a choice. He explained that since I lowered the bike and wanted performance, this was a good choice. I forgot to mention, this is my first bike, and I did all the work and upgrading myself. This pipe couldn't have fit better and easier. Awesome piece of equipment!
July 11, 2013
Finish
5 / 5
Performance
5 / 5
Thunderheader Exhaust
Love the way this exhaust sounds on my fatboy. My husband has one on his roadking and we are very impressed!
January 6, 2012
Finish
5 / 5
Performance
5 / 5
Rumble
Just what I had heard, great sound and looks great. Fast shipping and great communication
December 5, 2015
Finish
5 / 5
Performance
5 / 5
Great Pipes
Looks ands sounds great. It is bolt on horsepower for sure.
October 23, 2012
Finish
5 / 5
Performance
4 / 5
No Review Title Entered By User
One of the easiest pipes I've installed. (and I've installed many) It has that one and only thunderheader sound. Very good finish, I would recommend to others.
February 28, 2012
Finish
4 / 5
Performance
5 / 5
wanna make your bike sound like a drag bike?
very good investment for the price. It is only loud when you really twist the wick. Really increased the torque curve.At 65 or above you will really feel the push all the way up to where you think you are going to take off.At 120 you still can feel the torque pushing you back.
January 25, 2012
Finish
5 / 5
Performance
5 / 5
No Review Title Entered By User
No Review Text Entered By User
May 18, 2010
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 4 questions Browse 4 questions and 8 answers
Heat sheilds included?
Patrick H on Jan 3, 2017
BEST ANSWER: No they are not. For heat shields, order the following: H25035, 14 in. long style top front; H25034, 23 in. long style top rear; H25029, 13-1/2 in. collector
Does it work with mid controls or foward controls ?
Justin A on Nov 3, 2016
BEST ANSWER: I am unable to locate the answer to you inquiry, please contact our Tech Support Staff for further information at 1-800-969-7501
Ship to CA?
A shopper on Jul 24, 2017
BEST ANSWER: As shown in overview: 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.
I'm looking for a thunderheader exhaust mounting bracket!? just the bracket for a 2001 dyna fxdx? would I be able to purchase this?... thanks
A shopper on Jun 14, 2017
BEST ANSWER: I'm not 100% sure but I think you should be able to

Instructions and Manuals for Thunderheader 2 into 1 High Performance Exhaust System - 1026

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