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2 into 1 High Performance Exhaust System - 1027

  • Part #:
    H44024
  • Mfg Part #:
    1027
1 / 1

2 into 1 High Performance Exhaust System - 1027

  • Part #:
    H44024
  • Mfg Part #:
    1027
MSRP: $814.00

Price: $650.32 20% off!
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Thunderheader 2 into 1 High Performance Exhaust System - 1027
  • 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

OPTIONAL HEAT SHIELDS:

  • For 1986-99 FL models and all 2000-06 models, order 25-1656 for a full coverage set of 3
  • For 1986-99 FX models with forward controls, order the following: H25-033 9" mid rear; H25-037 8" top front; H25-029 13 1/2" collector, H25-039 13 1/2" top rear
    For long style 23" top rear heat shield order, H25-034
    For long style 14" top front heat shield order, H25-035


Included Items:
(1) Header
(2) 5/16-18 x 1-1/4 Hex Bolts
(2) 5/16 in. Plain Washers
(2) 5/16 in. Lock Washers
(2) 5/16 in. Nuts
(2) 3/8-16 x 3/4 in. Hex Bolts
(2) 3/8 in. Plain Washers
(1) Rear Support 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.

Specifications
Part #: H44024
Mfg #: 1027
Color Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 19.31 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader 2 into 1 High Performance Exhaust System - 1027

Part H44024 fits the following machines

Harley-Davidson
  • Heritage Softail - FLST 1986-1990, 2006
  • Heritage Softail Classic - FLSTC 1987-2006
  • Heritage Softail Classic Injected - FLSTC I 2001-2006
  • Heritage Softail Injected - FLST I 2006
  • Heritage Softail Nostalgia - FLSTN 1993
  • Heritage Softail Special - FLSTN 1994-1996
  • Heritage Softail Springer - FLSTS 1997-2003
  • Heritage Softail Springer Injected - FLSTS I 2001-2003
  • Softail - FXST 1986-1993
  • Softail Custom - FXSTC 1986-1999
  • Softail Deluxe - FLSTN 2005-2006
  • Softail Deluxe Injected - FLSTN I 2005-2006
  • Softail Deuce - FXSTD 2000-2006
  • Softail Deuce Injected - FXSTD I 2001-2006
  • Softail Deuce Injected CVO/SE - FXSTDSE 2003
  • Softail Deuce Injected CVO/SE - FXSTDSE 2 2004
  • Softail Fat Boy - FLSTF 1990-2006
  • Softail Fat Boy Injected - FLSTF I 2001-2006
  • Softail Fat Boy Injected CVO/SE - FLSTFSE 2005
  • Softail Fat Boy Injected CVO/SE - FLSTFSE 2 2006
  • Softail Night Train - FXSTB 2000-2006
  • Softail Night Train Injected - FXSTB I 2001-2006
  • Softail Springer - FXSTS 2000-2006
  • Softail Springer Bad Boy - FXSTSB 1995-1997
  • Softail Springer Classic - FLSTSC 2005-2006
  • Softail Springer Classic Injected - FLSTSC I 2005-2006
  • Softail Springer CVO/SE (EFI) - FXSTSSE 2007
  • Softail Springer CVO/SE (EFI) - FXSTSSE 2 2008
  • Softail Springer Injected - FXSTS I 2001-2006
  • Softail Standard - FXST 2000-2006
  • Softail Standard Injected - FXST I 2001-2006

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Reviews & Questions
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Browse 6 questions Browse 6 questions and 13 answers
Does it come with heat shields?
A shopper on Feb 17, 2018
BEST ANSWER: Thunder headers don NOT come with hear shields unless it says so specifically. More often than not, no.
Best fuel management to run with the thunder header ??2009 street glide
Termite on Jan 6, 2017
BEST ANSWER: Pipes are not going to change your fuel management. Simply a way to exit exhaust gases from the engine. Some pipes will do it more efficiently than others. Thunder headers are my favorite because they work better than any pipe I have found. Dyno proven by myself. From drag pipes to 4 different brands, All were run back to back.the thunder header didn't produce the overall most H.P. BUT, provided the highest H.P. AND torque combined. Torgue being that ability too provide the push you feel at the initial movement of the bike. No other pipe came close..( that I tried) I hope this answered your question.
Does this include heat shields?
Chris D on Dec 3, 2017
BEST ANSWER: No. The item has to specially say, WITH HEAT SHIELDS INCLUDED. Thunder headers typically cost around 800. With heat shields they are 1k -1200. If it doesn't say they ate included, they aren't
can it get sent to california for my bike (1996 flstc ?)
A shopper on Aug 10, 2020
BEST ANSWER: 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.
will it get shipped to california ?
A shopper on Aug 10, 2020
BEST ANSWER: 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.
Does this exhaust fit on the evolution motor?
A shopper on May 22, 2019
BEST ANSWER: I don't think so. I have a 95 Heritage, and a 2000 Fat Boy, and the bends in both the front and rear cylinders are different. Also the frame tubes are slightly bigger on the 2000 Fat Boy, even though they are both Soft Tails, the pipes are just different enough to not fit.
4.3 / 5.0
16 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
10
4
0
0
2
Finish
4.7 / 5
Fit
5.0 / 5
Performance
4.9 / 5
Styling
5.0 / 5
Value
3.0 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (2)
No (1)
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
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
Mpls, MN
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
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 my Thunderheader!!
I highly recommend this exhaust for your Harley. Mine ran perfect right out of the gate. I didn't have to change anything. I have a 2000 Fatboy with a carburetor. It looks great, and sounds even better. Plus it came to me in only three days. Sorry, I don't have pictures. WELL WORTH THE PRICE!!!
September 9, 2018
Purchased
1 year ago
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
Pittsburgh, PA
Finish
5 / 5
Performance
5 / 5
No Review Title Entered By User
No Review Text Entered By User
May 18, 2010
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
Fairfield, CA
Finish
5 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Value
3 / 5
Would you recommend this product?
Yes
Looks good sounds good performs well
Love this pipe. Fit perfect 1994 fat boy. Would recommend this pipe to all motor runs better has good torque
Runs better with the thunder header on it and it looks great recommend to all
Runs better with the thunder header on it and it looks great recommend to all
September 19, 2019
Islip terrace, NY
Purchased
11 months ago
Ride:
1994 fatboy
Excellent product, easy installation, works great with an S&S E carb. and K&N air filter. This is the second one I have owned and performs over the entire r.p.m. range. Gary R.
March 28, 2019
Purchased
1 year ago