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Cobra

909 Twins Mufflers - 6303

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Cobra

909 Twins Mufflers - 6303

MSRP Price: $399.95

Our Price: $313.88
Ships Free
You Save $86.07 (22%)
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MSRP Price: $399.95

Our Price: $313.88
Ships Free
You Save $86.07 (22%)
Item is Out of Stock
Make sure this fits your ride
Email Me When in Stock
Cobra 909 Twins Mufflers - 6303

The 4-inch diameter, 909-Twins feature a unique scalloped and smooth rolled outer tip that is matched with a scalloped inner tip. This "Twin" tip design gives an elegant look, especially because there are no visible outer screws securing the core. We use a 2.25-inch louvered core for its traditional and recognizable Harley sound. These mufflers carry our limited lifetime warranty too. Incredible styling, great sound, lifetime warranty. Tough to beat.

NOTE: Re-use stock clamps



Included Items:

(2) Chrome mufflers (Left,Right)

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 #: 4408542
Mfg #: 6303
Color - Primary Silver
Style Bologna/Slash-Cut Tip
Type Slip-On/Muffler
Units Set
Weight 21.65 lbs
Alternate/OEM Part Number(s):
18010867
Resources & Manuals
Fitment for Cobra 909 Twins Mufflers - 6303

Part 4408542 fits the following machines

Harley-Davidson
  • Street Glide Trike - FLHXXX 2010-2011
  • Tri Glide Ultra Classic - FLHTCUTG 2009-2019
Reviews & Questions
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Browse 2 questions Browse 2 questions and 6 answers
Is fuel management needed with these mufflers?
Delton K on May 24, 2017
BEST ANSWER: I bought these for my 16 TriGlide. Easy to install. Customer service said I would not have to install a fuel mgr system. I have not noticed much popping on deceleration. The only time I hear popping is if I back off the throttle all the way from a higher RPM. They have a lower rumble than the stock mufflers. I really like the sound, and the wife even said they weren't to loud. Hasn't changed my MPG from stock mufflers. Still avg between 32-34 mpg.
is this all I need to install these slip on mufflers on my trike?
larry on Aug 20, 2016
BEST ANSWER: I installed my 909s with the tires on. It takes longer, but you don't have to mess with the tires and re-torquing the lugs after 50 miles. I just lifted the rear-end, used jack stands and with the help of my new ratcheting box-end wrenches, everything came off quickly. I did the pipe clamp last to keep the slip-on steady.
4.4 / 5.0
13 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
11
0
0
0
2
Finish
5.0 / 5
Fit
4.6 / 5
Performance
4.5 / 5
Styling
4.7 / 5
Value
4.6 / 5
Loudness
Very Quiet
Average
Very Loud
Would you recommend this product?
Yes (11)
No (1)
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
Cobra slip on mufflers
I purchased these for my 16 TriGlide. I contacted Customer Support due to having some questions. They advised me that these were made specifically for the TriGlide. The installed in about an hour due to the stock muffler being difficult to remove. They are a little louder than I wanted but I"ll get use to the sound. Not as loud as the mufflers I had on my 08 Ultra. Overall I am pleased with the purchase. They look good and sound good. I have not heard any popping on decel so I'm hoping that I don't have to remap the system. Havent ridden enought miles to see if they affect the gas mileage. Will do update with and changes and photos later.
April 17, 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
A 2016 TRIGLIDE FROM VANDERVEST HARLEY IN GREEN BAY WI.
I PURCHASED A NEW 2016 TRIGLIDE FROM VANDERVEST HD IN GREEN BAY WI. THEY TOLD ME TO PURCHASE THE COBRA 909 EXHAUST FOR MY TRIGLIDE. GREAT FIT GREAT DEEP SOUND. GREAT PRICE.GREAT DEALERSHIP. KEN.
August 26, 2016
Finish
5 / 5
Fit
5 / 5
Loudness
Very Quiet
Average
Very Loud
Performance
4 / 5
Styling
5 / 5
Value
4 / 5
Would you recommend this product?
Yes
Mufflers fot Tri Glide
Great look and sound, easy to install. Winter in MN so don't know about performance yet.
January 24, 2017
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
Nice Street Low Rumble
The installation on my HD Trike took less than one hour. The sound was just what I wanted. The low rumble we all look for but rarely get. If anyone suggests to remove the baffles of your mufflers to make them louder - it will and your engine performance will suffer. The 909s gives you a louder low-end rumble that you & your neighbors can appreciate. Have someone record your first ride and then watch it. The sound is different when on the bike than when standing on the sidewalk. Cobra 909s are worth the investment.
The Slant Feature helps prevent scraping when entering a driveway.  Beautiful craftsmanship!
The Slant Feature helps prevent scraping when entering a driveway. Beautiful craftsmanship!
August 2, 2017
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
Danny 2017 Tri-Glide
Excellent product. Easy to install but require patience due to small area for rear bolts. No special tools required.
July 6, 2019
Hendersonville, TN
Purchased
1 month ago
Ride:
2017 TriGlide
Wife's trike
Bought theses for the wife's trike . Install new air cleaner and VH tuner and header trike sound bad Axx
June 12, 2017
Purchased
over 2 years ago
Loudness
Very Quiet
Average
Very Loud
Performance
4 / 5
Styling
5 / 5
Value
5 / 5
Would you recommend this product?
Yes
Look good easy install, sound great
Easy install sound good look great.
Easy install sound good look great.
August 12, 2017
Purchased
1 year 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
Great sound!
Good fit, sounds great, price was right!
Looks and sounds great on my 2016 TriGlide
Looks and sounds great on my 2016 TriGlide
November 27, 2018
Hanover, PA
Purchased
8 months ago
Ride:
2016 TriGlide
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
Very nice , good quality and a great sounding mufflers .
That are great sounding mufflers
July 1, 2018
Purchased
1 year 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
They sound great and really good on the trike
June 18, 2018
Purchased
1 year ago