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X-Series Exhaust System - 1074X

  • Part #:
    4406438
  • Mfg Part #:
    1074X
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X-Series Exhaust System - 1074X

  • Part #:
    4406438
  • Mfg Part #:
    1074X
MSRP: $1,448.00

Price: $1303.20 10% off!
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Thunderheader X-Series Exhaust System - 1074X
  • The new Thunderheader™ X-Series™ for Touring is our large diameter exhaust specifically designed for big cubic inch engines, built to produce big numbers
  • The X-Series™ is designed with 2 in. primary tubes with a 12 degree transition chamber to allow more exhaust flow
  • Unique patented baffle in conjunction with the trademark tail cone is designed to allow a free-flowing exhaust while creating an anti-reversion condition in the pipe which will aid the air/fuel flow on the intake stroke to allow more fuel into the combustion chamber
  • This means more torque at the low and mid RPM ranges and maximum horsepower at top end
  • The X-Series™ comes complete with heat shields and all mounting hardware, and bungs for both 12mm and 18mm O2 sensors
  • O2 sensor ports are pre-installed with O2 sensor plugs


NOTE: Also fits:
FLHRSE4 07-08
FLTRSE3 09
FLHTCUSE4 09



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



Included Items:

(1) Chrome steel 2 into 1 header assembly W/chrome steel heat shields installed

(1) Chrome steel muffler assembly

(1) Chrome steel muffler heat shield

(11) #28 Hose clamps

(1) #48 Hose clamp

(1) #56 Hose clamp

(1) Band clamp

(1) 5/16"-18 x 3/4" Hex head bolt

(1) 5/16"-18 x 1/2" Hex head bolt

(1) 5/16"-18 Nylock nut

(1) 5/16"-18 Hex nut

(3) 5/16" Flat washers

(1) Black steel mounting bracket

(1) Black steel square spacer

(2) Black aluminum round spacers

(2) 3/8"-16 s 3" Socket cap head bolts

(2) 3/8"-16 x 1-3/4" Socket cap 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 #: 4406438
Mfg #: 1074X
Color Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 31.40 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader X-Series Exhaust System - 1074X

Part 4406438 fits the following machines

Harley-Davidson
  • Electra Glide Classic - FLHTC 1999-2005, 2009-2013
  • Electra Glide Classic (EFI) - FLHTC 2007-2008
  • Electra Glide Classic Injected - FLHTC I 1999-2006
  • Electra Glide Injected CVO/SE - FLHTCSE 2004
  • Electra Glide Injected CVO/SE - FLHTCSE 2 2005
  • Electra Glide Police - FLHTP 2014-2016
  • Electra Glide Standard - FLHT 1999-2006, 2009
  • Electra Glide Standard (EFI) - FLHT 2007-2008
  • Electra Glide Standard Injected - FLHT I 2003-2006
  • Electra Glide Ultra Classic - FLHTCU 1999, 2009-2016
  • Electra Glide Ultra Classic (EFI) - FLHTCU 2007-2008
  • Electra Glide Ultra Classic CVO/SE - FLHTCUSE 4 2009
  • Electra Glide Ultra Classic CVO/SE - FLHTCUSE 5 2010
  • Electra Glide Ultra Classic CVO/SE - FLHTCUSE 6 2011
  • Electra Glide Ultra Classic CVO/SE - FLHTCUSE 7 2012
  • Electra Glide Ultra Classic CVO/SE - FLHTCUSE 8 2013
  • Electra Glide Ultra Classic CVO/SE (EFI) - FLHTCUSE 2 2007
  • Electra Glide Ultra Classic CVO/SE (EFI) - FLHTCUSE 3 2008
  • Electra Glide Ultra Classic Injected - FLHTCU I 1999-2006
  • Electra Glide Ultra Classic Low - FLHTCUL 2015-2016
  • Electra Glide Ultra Limited - FLHTK 2010-2016
  • Electra Glide Ultra Limited CVO/SE - FLHTKSE 2014-2016
  • Electra Glide Ultra Limited Low - FLHTKL 2015-2016
  • Road Glide - FLTR 1999-2002, 2009
  • Road Glide - FLTRX 2015-2016
  • Road Glide (EFI) - FLTR 2007-2008
  • Road Glide Custom - FLTRX 2010-2013
  • Road Glide Custom CVO/SE - FLTRXSE 2012
  • Road Glide Custom CVO/SE - FLTRXSE 2 2013
  • Road Glide CVO/SE - FLTRSE 3 2009
  • Road Glide Injected - FLTR I 1999-2006
  • Road Glide Injected CVO/SE - FLTRSE I 2000
  • Road Glide Injected CVO/SE - FLTRSE I 2 2001
  • Road Glide Special - FLTRXS 2015-2016
  • Road Glide Ultra - FLTRU 2011-2013, 2016
  • Road Glide Ultra CVO/SE - FLTRUSE 2011, 2015-2016
  • Road King - FLHR 1999-2006, 2009-2016
  • Road King (EFI) - FLHR 2007-2008
  • Road King Classic - FLHRC 2009-2013
  • Road King Classic (EFI) - FLHRC 2007-2008
  • Road King Classic Injected - FLHRC I 1999-2006
  • Road King Custom - FLHRS 2004-2006
  • Road King Custom (EFI) - FLHRS 2007
  • Road King Custom Injected - FLHRS I 2004-2006
  • Road King CVO/SE - FLHRSE 2014
  • Road King CVO/SE - FLHRSE 5 2013
  • Road King CVO/SE (EFI) - FLHRSE 3 2007
  • Road King CVO/SE (EFI) - FLHRSE 4 2008
  • Road King Injected - FLHR I 1999-2006
  • Road King Injected CVO/SE - FLHRSE I 2002
  • Road King Injected CVO/SE - FLHRSE I 2 2003
  • Street Glide - FLHX 2006, 2009, 2011-2016
  • Street Glide (EFI) - FLHX 2007-2008
  • Street Glide CVO/SE - FLHXSE 2010, 2015-2016
  • Street Glide CVO/SE - FLHXSE 2 2011
  • Street Glide CVO/SE - FLHXSE 3 2012
  • Street Glide Injected - FLHX I 2006
  • Street Glide Special - FLHXS 2014-2016

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Reviews & Questions
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Browse 6 questions Browse 6 questions and 13 answers
What tuner is recommended?
A shopper on Sep 12, 2016
BEST ANSWER: I use the screaming eagle pro supertuner. They don't allow Harley to sell it anymore but cause of it EPA issues. I'm sure they will have something else out soon. It works great. Enter an answer to this question.
Will this work well with 120r?
A shopper on Jul 24, 2017
BEST ANSWER: From what I was told you need even more motor than that for it to work well. Lots of cubic inches like 140+ is what I was told.
does it come with heat shields ?
c l on Dec 4, 2016
BEST ANSWER: Yes it does
How is this header system rated vs other header systems?
Michael B on Jun 28, 2020
BEST ANSWER: This is the second D&D exhaust that I've run. Flat out the best system I've run in over 20 years. The only problem I have is I'm riding a 2015 Heritage Softail Classic and the muffler drags very easy and really hard.
what is the lead time if ordered this week?
michael r on Oct 16, 2019
BEST ANSWER: Usually 7-10 days if you place it on backorder
What eghaust gaskets required OEM or ?
A shopper on Nov 26, 2017
BEST ANSWER: Yes OEM or equivalent, recommend putting new ones in when installing
3.0 / 5.0
3 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
1
0
1
0
1
Finish
3.0 / 5
Fit
3.7 / 5
Performance
3.7 / 5
Styling
3.0 / 5
Value
2.7 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (2)
No (1)
Finish
1 / 5
Fit
1 / 5
Performance
1 / 5
Styling
1 / 5
Value
1 / 5
Would you recommend this product?
Yes
Thunderheader should step it up
Dennis Kirk was great, thunderheader..... Not so much. Received pipe and like others opened it to see a pipe covered in rust. Not what I would expect from a well known company. Oh well lost my dime and anyone else I know. Decided to go with d&d
May 8, 2017
Finish
3 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
3 / 5
Value
2 / 5
Would you recommend this product?
No
A noticeable change in performance but the quality of the chrome sucks. For the price, you would think the quality would be better.
June 27, 2019
Clarkston , MI
Purchased
1 year ago
Ride:
Harley Road king classic
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
Customer service was excellent. Product was delivered fast and worked perfect.
July 30, 2016
Purchased
over 4 years ago