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2 into 1 High Performance Exhaust System - 1067

  • Part #:
    4406473
  • Mfg Part #:
    1067
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2 into 1 High Performance Exhaust System - 1067

  • Part #:
    4406473
  • Mfg Part #:
    1067
MSRP: $845.00

Price: $646.38 24% off!
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Thunderheader 2 into 1 High Performance Exhaust System - 1067
  • ThunderHeader head pipes have been tuned to the proper length and diameter to produce maximum horsepower and a excellent torque curve
  • A patented collector is used
  • The collector is designed to direct spent gases through four acoustical dampening chambers
  • The flow director serves a multi-task function: directs outgoing flow through four acoustical dampening chambers creating a spiral motion upon exiting to atmosphere and it also forms a pyramidal shaped anti-revision trap to minimize the amount of air rushing in
  • In conjunction with the flow director, a diffuser shroud is attached to the reverse cone, this patented device is designed to defuse the air rushing in as the pressure inside of the system becomes equal to atmosphere
  • Heat shields not included


For heat shields use PART NO. 25-1656 (3-piece set)

Included Items:
(1) Header
(1) Rear support bracket
(2) 5/16-18 x 1-1/4 in. Hex bolts
(2) 5/16 Plain washers
(2) 5/16 in. Lock washers
(2) 5/16-18 Nuts
(2) 3/8-16 x 3/4 in. Hex bolts
(2) 3/8 in. Plain washers

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 #: 4406473
Mfg #: 1067
Color Chrome
Finish Chrome
Style Tapered Tip
Type 2-Into-1 System
Units Each
Weight 19.80 lbs
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Resources & Manuals
Fitment for Thunderheader 2 into 1 High Performance Exhaust System - 1067

Part 4406473 fits the following machines

Harley-Davidson
  • Heritage Softail Classic - FLSTC 2012-2017
  • Softail Blackline - FXS 2012-2013
  • Softail Convertible CVO/SE - FLSTSE 3 2012
  • Softail Deluxe - FLSTN 2012-2017
  • Softail Deluxe CVO/SE - FLSTNSE 2014-2015
  • Softail Fat Boy - FLSTF 2012-2017
  • Softail Fat Boy Lo - FLSTFB 2012-2016
  • Softail Fat Boy S - FLSTFBS 2016-2017
  • Softail Slim - FLS 2012-2017
  • Softail Slim S - FLSS 2016-2017

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Reviews & Questions
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Browse 5 questions Browse 5 questions and 13 answers
Does this exhaust system come with everything it needs to hook up to the heads?
eubiie on Oct 14, 2016
BEST ANSWER: Yes. If you are careful you can re-use the header pipe gaskets BUT the gaskets are inexpensive, just a few dollars each. So, you will have better luck, I think. if you order new gaskets.
Also, the heat shields are a PITA to install with the pipes on the bike so if you get heat shields and can put them on the pipes before installing the pipes you will save yourself much grief.
Hello will this exaust fit my 1999 Kawasaki Vulcan 1500 nomad ??. Thx u
A shopper on Apr 14, 2019
BEST ANSWER: No, see fitment tab for correct fits
Will this exhaust fit a 2015 HD Softail Deluxe CVO?
1/2 Pint on Sep 4, 2016
BEST ANSWER: Yes it should
Does it come in black?
John E on Nov 15, 2016
BEST ANSWER: I'm unaware of what bike model you have, but here is the black version:

https://www.denniskirk.com/thunderheader-racing-products/2-into-1-high-performance-exhaust-system-1035b.p4407265.prd/4407265.sku
Do the pipes have heat shields?
John on Jul 4, 2017
BEST ANSWER: Yes, however they require a separate kit of the shields to be purchased
4.8 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
3
1
0
0
0
Finish
4.8 / 5
Fit
4.8 / 5
Performance
5.0 / 5
Styling
4.8 / 5
Value
4.5 / 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
If I had more Harley I buy more Thunder headers
Talk about fit went right on no issues looks good the crown was perfect couldn't ask for a better price
User submitted image
Added Dec 13, 2016
December 13, 2016
Purchased
over 3 years ago
Finish
5 / 5
Fit
4 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
5 / 5
Value
5 / 5
Would you recommend this product?
Yes
Great exhaust system
I love these pipes. They sound great and there was a noticeable power increase with the exhaust and Screamin' Eagle Heavy Breather intake. The only problem was the two front heat shields did not fit well with the collector heat shield. It took a lot of altering to try to get radii to match, but there was still more of a gap between them than I would have liked.
After
Before
May 18, 2017
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
Thunderheader pipe best deal ever
Had the Harley dealer install pipe and perform tune up along with a high air flow air breather.
Increased horesepower and torque. and sounds better than I expected.
I would recommend this product to anyone.
October 11, 2017
Purchased
over 2 years ago
Finish
4 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
5 / 5
Styling
4 / 5
Value
3 / 5
Would you recommend this product?
Yes
One Of A Kind Sound - Quality Control could be better for the price
Love the sound. No other exhaust system LOOKS or SOUNDS like a Thunderheader. Deep & thumpy! Had V&H pipes for 40,000 miles which are definitely louder but ratty too. Have cams, heads & pistons so the Thunderheader really roars. Thunderheader Corp claims increased torque & potential horsepower but I haven’t had the bike dyno’d again so I can’t confirm their claims yet. On the pipe itself, the quality & weight is NOT as good as what the V&H was. Expected welds to have been a little better before chrome was applied, especially since they boast “Built in USA” however fitment is good. With the heat shields not being included (like every other pipe on the market) the complete system is more expensive than most any other.
User submitted image
Added Apr 21, 2019
April 21, 2019
Ames, IA
Purchased
1 year ago
Ride:
2012 Harley FLS