Competition Werkes GP Slip-On Exhaust System for the Ninja 300R

There is nothing like the rumble of an aftermarket exhaust while decelerating into a corner. If you’re going to build a streetfighter, you need a sound to match the look; something that gives the bike a loud, in-your-face persona and  makes people stare as you ride down the street.

In 2013, Competition Werkes developed the GP shorty slip-on exhaust system for the Ninja 300 that transforms the bike’s passive thrum into a race bike’s growl. The system produces a little more bottom end grunt to gives you a snappier feel at the throttle and leaves an inevitable grin on your face.

The system is hand crafted from 304 stainless steel and has a tapered baffle for “improved performance and advanced tuning.” The canister is small and compact giving the bike a lighter, tighter feel without sacrificing styling. We installed the stainless steel GP system on our Ninja 300R Streetfighter project bike and here’s how we did it.

Step 1:

Make sure you have all the hardware and clamps needed to install the system.

The GP exhaust system comes with the muffler, high shield, 4mm allen bolt, pipe clamp and sticker.

The GP exhaust system comes with the muffler, high shield, 4mm allen bolt, pipe clamp and sticker.

Step 2:

To remove the heat shield from the stock exhaust can, remove the 5mm allen bolt and the clamp on the mid pipe with a Phillips screwdriver.

Remove the 5mm allen bolt.

Remove the 5mm allen bolt.

Loosen the bottom clamp with the Phillips screwdriver.

Loosen the bottom clamp with the Phillips screwdriver.

Step 3:

Pull the bottom clamp on the mid pipe down or toward the front of the motorcycle, then pull the heat shield toward the front of the motorcycle to remove it.

Pull the bottom hose clamp down the mid pipe, then slide the heat shield forward (toward the front of the bike) to remove it.

Pull the bottom hose clamp down the mid pipe, then slide the heat shield forward (toward the front of the bike) to remove it.

Step 4:

To remove the stock exhaust can, loosen the clamp around the muffler with a 12mm socket or T-handle.

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Step 5:

Remove the 14mm bolt and nut from the rear set.

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Step 6:

Pull the exhaust toward the rear of the motorcycle.

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Notice how the stock exhaust has a muffler gasket while the Werkes USA exhaust does not. This is because the Werkes USA exhaust muffler slides forward onto the midpipe until the bolt hole for the heat shield is just forward of the rear set heel guard bolts. The Werkes USA exhaust does not need an exhaust gasket!

Stock (left), Werkes USA (right)

Stock (left), Werkes USA (right)

Step 7:

Remember to slide the Werkes USA clamp onto the mid pipe before sliding on the Werkes USA canister onto the midpipe.

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Put a rag over the swing arm to avoid scratching or denting the Werkes USA canister while wiggling or sliding it over the mid pipe. Note: It is a tight fit, so it takes a little body English.

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Clean the Werkes USA exhaust thoroughly on the outside with WD-40 or comparable cleaning substance to avoid discoloring the canister after starting the motorcycle.

Step 8:

Tighten the hose clamp. Install the new stainless steel heat shield with the 4mm allen bolt provided.

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Final Step:

Make sure you clean the outside of the pipe with WD-40 or a comparable product before running the motorcycle to avoid discoloration.

Start and enjoy.

Tools I used: 3/8’’ ratchet with 14mm and 12mm sockets, Phillips screwdriver, 12mm T-handle, 14mm wrench 4mm/5mm T-allen wrenches

Tools I used: 3/8’’ ratchet with 14mm and 12mm sockets, Phillips screwdriver, 12mm T-handle, 14mm wrench
4mm/5mm T-allen wrenches

We put each exhaust system (both stock and the Werkes USA muffler) on the scale. The stock exhaust weighs 17.5 lbs. while the Werkes U.S.A. exhaust weighs 2.5 lbs. This is a total weight savings of 15 pounds!

We put each exhaust system (both stock and the Werkes USA muffler) on the scale. The stock exhaust weighs 17.5 lbs. while the Werkes U.S.A. exhaust weighs 2.5 lbs.
This is a total weight savings of 15 pounds!

You can purchase the GP slip-on exhaust for an m.s.r.p. of $399.95. The exhaust is also available in Carbon Fiber, Cobra Black, Cobalt Black, Tungsten, Titanium, Mag Silver, Satin Silver and Gold for $100 more, as well as Black Velvet for $50 more. The install takes roughly ten minutes and is very easy. With the Competition Werkes GP exhaust, you’ll be where on your way to a lighter, faster and better-sounding machine in no time!

Competition Werkes is an aftermarket motorcycle accessories and parts company that has been producing fender eliminator kits, exhausts and much more for motorcycles since 1984. To find out more about their products, click here.

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