Dennis Kirk Inc.
Search Within
Ride Search
Top 3 Product Matches

Black 2-into-1 High Performance Exhaust System - 1027B

  • Part #:
    4407263
  • Mfg Part #:
    1027B
1 / 4

Black 2-into-1 High Performance Exhaust System - 1027B

  • Part #:
    4407263
  • Mfg Part #:
    1027B
MSRP: $814.00

Price: $732.60 10% off!
Make sure this fits your ride
Ships Free
In Stock - 6 on Hand

Thunderheader Black 2-into-1 High Performance Exhaust System - 1027B
  • 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, full coverage set of 3, order PART NO. 25-1727


Included Items:
(1) Black 2-into-1 head pipe muffler assembly with non removable baffle
(1) Black steel mounting bracket
(1) 3/8 in.-16 x 3/4 in. hex head bolt
(4) 5/16 in. flat washers
(2) 3/8 in. flat washers
(2) 5/16 in.-18 nut
(2) 5/16 in.-18 x 1 1/4 in. hex head bolts
Instructions

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 #: 4407263
Mfg #: 1027B
Color Black
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 18.10 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader Black 2-into-1 High Performance Exhaust System - 1027B

Part 4407263 fits the following machines

Harley-Davidson
  • Heritage Softail Classic - FLSTC 1987-2006
  • Heritage Softail Classic Injected - FLSTC I 2001-2006
  • Heritage Softail Springer - FLSTS 1997-2003
  • Heritage Softail Springer Injected - FLSTS I 2001-2003
  • 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 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

Trending

Reviews & Questions
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 15 questions Browse 15 questions and 16 answers
Will this fit 08 street glide 96ci?
A shopper on Aug 5, 2016
BEST ANSWER: NO, this is for a Softail. For an 08 Streetglide you would need part number 44-07266
Are heatshields required or just personal preference on thunderheader pipes on harley softail ????
A shopper on Sep 10, 2018
BEST ANSWER: Heatshields are personal preference on Thunderheader pipes. I personally think wrapping the Thunderheader looks better.
Will this fit my Fatboy with floor boards?
Smoking Mike on Aug 8, 2019
BEST ANSWER: Yes it should
Will this fit my 2016 fatboy S with the 110?
Eric S on Jul 6, 2019
BEST ANSWER: No, see fitment tab for correct fits
2019 FXBB Do you have slipons or 2 into 1 in black??
SynthetikBlue S on Feb 18, 2019
BEST ANSWER: https://www.denniskirk.com/exhaust/2019-harley-davidson-softail-street-bob-fxbb.mmy/1.pg
Will this fit a 2019 softail street bob?
Matt S on Nov 13, 2018
BEST ANSWER: No, see fitment tab for correct fits
Will these fit 1982 HD FLHS ?
Shovel on Nov 6, 2018
BEST ANSWER: No, see fitment tab for correct fits
What size o2 bugs r on them ?
Nicholas B on Sep 20, 2018
BEST ANSWER: None on these
I want this system but in chrome. Its for a 2003 HD softail heritage classic springer f. inj Do you sell, if not can you supply a Theader part # please ??
A shopper on Mar 19, 2018
BEST ANSWER: https://www.denniskirk.com/thunderheader/2-into-1-high-performance-exhaust-system-1027.pH44024.prd/H44024.sku
Why will this not fit an 07 fxdb efi?
A shopper on Feb 17, 2018
BEST ANSWER: See fitment tab for correct fits
Are these legal in Orange County California?
A shopper on Oct 30, 2017
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 this fit a 2016 Rodeglide?
A shopper on Sep 11, 2017
BEST ANSWER: No, see fitment tab for correct fits
does this part fit with forward controls?
jesse on Apr 6, 2017
BEST ANSWER: yes
Will this fit a 2016 fxdls ?
Arthur H on Nov 14, 2016
BEST ANSWER: No. It is not on our fitment chart.
Does this pipe come w a catalytic convertor...?????
Arthur H on Nov 14, 2016
BEST ANSWER: I cannot locate the answer to that question, I recommend contacting Thunderheader for accurate information on this inquiry:

http://www.thunderheader.net/contact.php
5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
2
0
0
0
0
Finish
5.0 / 5
Fit
5.0 / 5
Performance
5.0 / 5
Styling
5.0 / 5
Value
5.0 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (2)
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
Yes I love it
July 25, 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
return
I am very happy with my new exhaust. but i dont want the heat shields. May i return them?
August 7, 2018
Purchased
over 2 years ago