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Black X-Series Exhaust System - 1073XB

  • Part #:
    4409870
  • Mfg Part #:
    1073XB
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Black X-Series Exhaust System - 1073XB

  • Part #:
    4409870
  • Mfg Part #:
    1073XB
MSRP: $1,448.00

Price: $1303.20 10% off!
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Thunderheader Black X-Series Exhaust System - 1073XB
  • Thunderheader™ X-Series™ 2-into 1 exhaust systems for Touring models 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
  • Complete with heat shields and all mounting hardware, and 12mm O2 sensor bungs
  • O2 sensor ports are pre-installed with O2 sensor plugs

 



Included Items:

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

(1) Black steel muffler assembly

(1) Black steel muffler heat shield

(11) Small black hose clamps

(2) Large black hose clamps

(1) Band clamp

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

(3) 5/16" Flat washers

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

(1) 5/16"-18 Nylock nut

(1) 5/16"-18 Hex nut

(1) Black steel mounting bracket

(1) Black steel square spacer

(2) Black aluminum round spacers

(1) 3/8"-16 s 3" Socket cap head bolt

(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
Color Black
Mfg #: 1073XB
Part #: 4409870
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 31.25 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader Black X-Series Exhaust System - 1073XB

Part 4409870 fits the following machines

Harley-Davidson
  • Electra Glide Police - FLHTP 2017-2020
  • Electra Glide Standard - FLHT 2019-2020
  • Electra Glide Ultra Classic - FLHTCU 2017-2019
  • Electra Glide Ultra Limited - FLHTK 2017-2020
  • Electra Glide Ultra Limited CVO/SE - FLHTKSE 2017-2020
  • Electra Glide Ultra Limited Low - FLHTKL 2017-2019
  • Road Glide - FLTRX 2017-2020
  • Road Glide CVO/SE - FLTRXSE 2018-2019
  • Road Glide Limited - FLTRK 2020
  • Road Glide Special - FLTRXS 2017-2020
  • Road Glide Ultra - FLTRU 2017-2019
  • Road King - FLHR 2017-2020
  • Road King Police - FLHP 2019-2020
  • Road King Special - FLHRXS 2017-2020
  • Street Glide - FLHX 2017-2020
  • Street Glide CVO/SE - FLHXSE 2017-2020
  • Street Glide Special - FLHXS 2017-2020
Reviews & Questions
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Browse 3 questions Browse 3 questions and 3 answers
doe it take wide band o2 sensors?
A shopper on Jun 24, 2020
BEST ANSWER: Yes it has bungs for both 12mm and 18 mm o2 sensors
Just bought a 2018 FLHXS wanted to put a Thunderheader on it but it would "VOID" my warranty.THAT SUCKS!!!??
A shopper on Sep 3, 2017
BEST ANSWER: I know, it's an EPA thing
Is this unit crome with black heat shields?
A shopper on Aug 5, 2017
BEST ANSWER: Yes
4.3 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
3
0
0
1
0
Finish
4.5 / 5
Fit
4.5 / 5
Performance
4.8 / 5
Styling
4.8 / 5
Value
4.3 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (4)
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
looks great sounds awsome
April 16, 2018
Medina, NY
Purchased
over 2 years ago
Ride:
2017 FLHXS
Finish
3 / 5
Fit
3 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
4 / 5
Styling
4 / 5
Value
3 / 5
Would you recommend this product?
Yes
Too Hot
To start with I love thunder header but the x series I put on my 2018 cvo street glide is extremely hot on the leg partially has to do with you can not use the mid frame heat deflector and all the heat is on your leg. And yes the bike was tuned by Harley.
September 8, 2018
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
Pleasure Principle
Absolutely love this 2 into 1 Black X-Series Exhaust System. It sounds great, looks great and delivers outstanding power and performance on my M8-114 with SE-Stage III Kit. This combination of exhaust and SE-Stage III Kit makes my Harley-Davidson an absolute joy to ride. I can’t get enough of it, and when I start it up and twist the throttle, it gets your attention.????????????????
March 28, 2020
Homestead, FL
Purchased
7 months ago
Ride:
2020 Road Glide Limited
Finish
5 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Would you recommend this product?
Yes
Great fit and sound
November 9, 2017
Purchased
over 2 years ago