Share This Article
When you think of muffler systems for the Kawasaki KX450, you think of The Pro Circuit Ti-6 muffler system. I have tested a lot of different mufflers for the KX450, but what does the Pro Circuit system bring to the table for the money? The PC Ti-6 system will set you back $1270.00 and will cut around 1.5 pounds off from the stock muffler that looks atrocious on the bike anyway. The Pro Circuit system is still is on the long side but looks more compact on the bike than the bulky stock muffler does. The sound pitch although louder than I would like, it does sound racey. I prefer the insert in for sound and power delivery, but more on that below.
So what does the Pro Circuit Ti-6 muffler do to the power character of the KX450? Let’s first discuss what the stock power character is like. The stock KX450 character has an abrupt on/off feel from 0-10% throttle opening then smooths out for the rest of the curve. I like to get rid of that on/off low rpm feel with the CHA Map (you can find that map on our website) but I would like to have a little more mid-top end pulling power once I am accelerating out of the corner! The KX has a linear feel to it which makes it easier to ride but overall I would like a harder pull through 2nd-3rd gears.
The Ti-6 comes on a little harder down low than the stock muffler which doesn’t help with the low RPM (0-10%) on/off feel but it does increase the pulling power out of corners in second gear. The PC system pulls longer out of corners when you’re in second gear and will pull third gear in more corners than the stock system. The KX450 is still not your lugging type of machine but the PC system does help the rider be a little lazier if/when that time arrives during your moto. The mid range is healthier with more added torque and pulling power on top is also slightly increased which makes pulling those important 2nd-3rd gears in sand easier. The PC headpipe is shorter than stock so its nature is to come on sooner/quicker so I like to leave the insert in the Ti-6 muffler instead of pulling it out.
I also leave the screen in as well for the simple fact that it helps that on/off 0-10% throttle feel. With the insert out it makes the muffler note louder but also makes it snappier which I didn’t like as much. I preferred the insert in because it smoothens out that initial hit (compared to insert out) and broadens the power versus coming on quick and signing off a little sooner. The overall muffler packing life is standard with around 12-15 hours of ride time until you should repack. Repacking is not a huge deal on the PC system and PC sells repacking kits that you can do at home.
Overall, I am happy with the gains of the Pro Circuit Ti-6 system as it will provide more pulling power than stock and gives the rider more excitement than the stock system. Not to mention it looks a hell of a lot better than the stock system! Matching this system with the CHA map that is here on our site makes this machine an easier green bike to ride faster.
Note: If you are a KX250/450 owner make sure to reinforce your subframe/muffler tab as the stock weld will not last long with ANY aftermarket muffler system. Yes, even if you rubber mount the system to the subframe, the weld is not strong enough to hold onto ANY aftermarket muffler for long duration. We have broken several tabs from a KX250 as well as KX450 when we DO NOT re-weld. Find your local welder and BEEF it up!
