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Cobra 3" RPT Slip On Mufflers Chrome

J&P Cycles Part Number: 178-328

Manufacturer Part Number: 6054

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Description for Cobra 3" RPT Slip On Mufflers Chrome

• The RPT slip-ons make use of all of the high-tech features of Cobra's regular three-inch slip-on mufflers, including two-inch constant velocity cores for exceptional sound and performance, as well as the bonded e-glass and stainless steel mesh

• The RPT designation comes from adapting the design from our Race-Pro four-inch muffler into this three-inch size

• The bodies begin as three-inches at the front until they expand to three and a half inches at the rear

• The tip is also the Race-Pro machined design that's held in place with 12-point bolts

• Fits stock headpipes

• Easy install using stock mounting brackets

Product Specs

Product Specs for Cobra 3" RPT Slip On Mufflers Chrome

End Cap Or Tip Color:
End Cap Or Tip Material:
End Cap Or Tip Style:
Straight Cut
End Cap Or Tips Finish:
Head Pipe Diameter:
Heat Shield:
Not Included
Manufacturer Part Number:
Muffler Color:
Muffler Diameter:
Muffler Finish:
Muffler Material:
Stainless Steel
Muffler Style:
Sold in Units:
Warehouse Part Number:
Fitment Questions?

With over 750 years of experience combined, our tech staff has the answers!

Compatible Models

Harley-Davidson® Models

  • Softail Night Train EFI FXSTBI : 2001–2006
  • Softail Night Train FXSTB : 2000–2006
  • Softail Springer EFI FXSTSI : 2001–2006
  • Softail Springer FXSTS : 2000–2006
  • Softail Standard EFI FXSTI : 2001–2006
  • Softail Standard FXST : 2000–2006
Customer Reviews

Customer Reviews for Cobra 3" RPT Slip On Mufflers Chrome

Overall Rating

5 out of 5 stars (based on 15 reviews)

5 stars (11)

4 stars (2)

3 stars (2)

2 stars (0)

1 star (0)

0 stars (0)


Oooooh Yeahhh!!! A very BIG THANX cobra people... I can actually say, this buy is VALUE FOR MONEY. My Buke is so ALIVE again. My Fatty GROWLS like a hungry Lion. It sounds so so so good cant explain. I love em


Workmanship and appearance are to the standard I expected from Cobra. However the mounting is off to the point as where none of the mounting holes or brackets line up without drilling new holes and the rear bracket is positioned as where it would only be possible to get one of the mounting holes in the Cobra mufflers . ( FLSTNSE-110 Screaming Eagle) Soft tail-Deluxe.


There chrome race pro muffle was easy to change out and was exactly what I was looking for. I get many complements.


great sound, and fitting them was easy


Bought for my 16 Breakout. Woke the bike up. Still have baffles in and don't think I'll take them out as they are plenty loud. I would recommend.


It took about 2 weeks to arrive because Cobra was out of stock. The fit was easy and was installed in less than an hour. The finish is great. My only complaint is that they are way to loud for me and Cobra doesn't make a quiet baffle for the RPT slip ons.


5 Star


It's all good so far!really like the rumble,noticeable increase in pulling power in 5th and 6th ,,, wife thinks they are too loud,a slight increase in idle speed,I have the fi kit and once i get that and the Ness filter on im sure the 96 inch twin will roar,, fit was perfect! the hardest part was getting the factory front muffler off, ordered new clamps but didnt really need them,the fit was perfect,, definitley fast and furious! really nice machine gun timeing when cruising sweet rock and roll music to my ears! KMAN


Had the OEM Harley pipes on which really didn't sound like a Harley. The great thing about the Cobra pipes is you are in control. If you don't want to wake the neighborhood you can keep your RPM really low and quietly sneak out of the neighborhood. Conversely, if you want to let them know you can give a slight rev on the gas and they'll know you have new pipes! Same at stoplights..and, every time you take off from a dead stop - you will know they are not OEMs and so will everyone else. Good throaty sound. Definitely a good buy.


I shopped and shopped, looking at so many options. And reviewing the sound of my options on youtube and various media outlets. I do recommend checking out The Vance and Hines and Cobra apps, to get an idea of the differnt sounds and tones. I ordered these and love them. Easy to install, took about 30 mins and SOUND AMAZING!! Great idle tone and deep throaty sound at "off idle". I highly recommend these to anyone. I ordered these from J&P Cycles on a Sunday and had them on Tuesday! Fast and awesome shipping for being free! I was shocked.

Instructions & Manuals
Important Product Notes

Note: Please see U.S. EPA and your respective state and local regulations to confirm noise and emission compliance.

Important Exhaust Notes:

• Note: With any new exhaust, we recommend changes to carburetor jetting or use of an aftermarket fuel injection control module.

• There is no warranty on exhaust pipes and mufflers with regard to any discoloration. Blueing is caused by tuning characteristics, cam timing, carburetor jetting, overheating, etc. and is not caused by defective manufacturing. No refunds on exhaust pipes once motorcycle is started unless there’s a manufacturer’s defect.

• Flanges and retaining rings are not included with most aftermarket exhaust for 1984-2013 Evolution and Twin Cam models. Re-use your existing hardware, or purchase replacement hardware.

Shipping Note

Due to state regulations we cannot ship this item to the state of California.

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