ALL EXHAUSTS FIT ALL MODEL YEARS (1987-2009)
It is universally agreed in this forum, and through race testing (@fog), changing the OEM exhaust provides no worthy power gains over Fog's Air box Mod with tuning, and may decrease performance. With some mods you can change the power band slightly. You will NOT need to change carburetor parts (i.e. Jet Kit) for exhaust swaps.
Dec 17, 2018
Since these things APIPEANDAJETKIT are marketed as hop ups and sold widely to unsuspecting folks, who just want their desire to make noise justified, I though a little explanation warranted.
When you put on the wonderful free flowing pipe. you really hurt you stock engine.
The EX has rather radical cam timing that is only possible because the restrictive stock mufflers help hold the gas charge in the cylinder allowing a greater incoming charge.
when you take that away (the back pressure) you don't get more power you loose some.
to help this condition a bit you use large fuel jetting, this results in the wrong mixture almost everywhere and does not help the problem much
The problem is one of resonance that puts high and low pressure point all along the pipe and when you get a low at the exhaust valve (with the pipe) all the new charge is sucked out and you get a giant flat spot in the acceleration curve.
There really is no fix for this and a pipe applied to this engine requires serious changes to the cam timing and will only work at a more narrow range of RPM and throttle .
in short Kawasaki spent a lot of time and money to make this engine produce the hp it does (more then 100 hp per liter) and still be drivable on the street
If you think you can do better , you're wrong.
There are no scientific studies I was able to find for or against this belief. I understand you may believe this is fact, but the physics of sound waves and directional travel would contradict this. At the end of the day it's your money, spend it how you want.
An improved look/individuality because beauty is in the eye of the beholder. Different sound because you don’t “enjoy” the factory sound. Weight loss because less weight takes less energy to get the same speed. (For some of us it’s cheaper to lose weight on the rider end though) Potentially easier access to the chain for regular maintenance (2-1 parked on the right side).
If you replace the entire system be sure to replace the copper gaskets (Part #11009-1840). Most new systems will come with them but used ones may not.
Caution: Some full system exhausts may eliminate the ability to use your center stand and/or lower cowling.
Caution: 2-1 exhausts existing on the right side will cause the center stand to hit the chain. You will need to figure out a way to deal with this. Check out the bracket in the LASER brochure (in post #10) for an idea.
Disclaimer: I have not personally installed any non-OEM exhaust on my motorcycle. All compatibility writing contained here is based on feedback found throughout the forum. I am not responsible if your parts don’t fit the way you want.
Delkevic (2-1 & 2-2) $$
- Full system Delkevic US Full Exhaust Systems | Kawasaki | 2009 | GPZ500S EX500C(1987-2003)
o All images on the website show lower cowl and center stands.
- Muffler/Slip On Delkevic US Silencer Kits | Kawasaki | 2009 | GPZ500S EX500C(1987-2003)
Hindle (2-1) $$$
- Full System Hindle Performance: Kawasaki EX500 Front Section
o No images, but forum reports no loss of center stand or lower cowl. Full system doesn't appear to come with mufflers
- Mufflers available to fit the full system only
Predator (2-2) $$$
- Full System Kawasaki GPZ500S Exhaust, Kawasaki GPZ500 Exhaust, GPZ500S, GPZ500, GPX500 Exhaust, EX500 Exhaust, EX500, GPX500
o Claims to function with stand and fairings.
o UK Based company, unsure if they have importers to the USA.
- Mufflers also available Kawasaki GPZ500S Exhaust, Kawasaki GPZ500 Exhaust, GPZ500S, GPZ500, GPZ500 S Exhaust, GPX500 Exhaust, GPX500, EX500 EXHAUST
o Only manufacturer that seems to also make replica stock exhausts. These may not function/sound exactly as stock. KAWASAKI GPZ500 silencers, KAWASAKI GPZ500S exhaust, marvin exhausts, marvin silencers, marvin replica silencers, KAWASAKI parts
Exhausts from/for the Kawasaki ER5 (All years) will fit the engine. These exhausts may require the modification of the center stand or fairing.
- Motad 2-1 (Current production)
Any number of “universal” style mufflers from @MOTORCYCLEiD/amazon/eBay/etc.
- D&D: Full system does not come with mounting brackets to reposition the lower fairing, also does not work with the center stand.
- Jardine: 2-1 that runs on the left side. Came with center stand stopper. Unknown if able to keep lower cowling.
- Micron Exhaust
- Muzzy’s: Website appears broken when clicking on Kawasaki brand name. I was unable to find a list of any available units at all.
- Vance & Hines: Rumored to keep your center stand and lower cowling (with some trimming)
- Kerker (By Supertrapp)
- Laser Exhausts (UK based): 2-1 compatible with center stand
- 2 Brothers: Only 1 mention on the forum, no other confirmation
Posts of video with sounds of your aftermarket exhaust would also be welcome to assist in answering questions.
Last Updated 3/23/2021