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There is something about a crisp sounding two stroke. I am not a huge two-stroke rider but to me the best thing about a two-stroke is that crisp/over-rev sound that happens right before you land from a jump! That gets me going! But what about going to an aftermarket pipe/silencer? Does it make the bike perform better on the track? We got our 2025 KTM 250 SX and picked up a Pro Circuit Works pipe and shorty silencer. How did it work on the track? Read below and find out!
The Works and pipe and Shorty silencer bolt on with easy and will not cause you any headaches. I prefer the raw look over the platinum look and to me the PC Shorty silencers have always been one of the best silencers on the market for any two stroke. Not to mention they have the best sound/pitch to them compared to other silencers on the market. Something about that bark that the R304 has is exactly what I am looking for.
Compared to the stock system the PC system will give you more pulling power out of corners, a healthier mid range rpm response and better top end pull! YES! It does all of this! After riding the stock system and PC system back to back at Glen Helen a couple times, I didn’t want to take the Pro Circuit package off, but for the sake of changing track conditions, I did. Coming out of the corners the KTM 250SX now had some added pulling power in second gear yet didn’t sign off as quick as the stock system. Not to mention that it cleared up a little bit of the rich feeling the KTM had on low rpm situations. Yes, the KTM 250SX will still take some time to clear out when warming up but on the track the crispness or recovery of the PC system was much better than the stock system. Another added bonus was that I could carry third gear a little better with the PC system (still not vey lugable, but it does help a little) through corners and if I was bogging a little, a simple fan of the clutch and the Husqvarna was back into the meat of the power (unlike the stock system which was kind of lethargic in that area). Recovery feel is a big thing for me as I am pretty lazy because as I have been riding four strokes for so long, so having that added mid range rpm recovery/response helped me in those tighter/ruttier corners that I seem to mess up in. My favorite feature about the Pro Circuit pipe/silencer combo was the top end pulling power I had going up the hills of GH. I now could let the KTM eat longer in third gear without it revving out and allowed me to live in 2nd and 3rd gears longer than I could with the stock system. Instead of having to immediately shift out of corners, I could let it eat a little longer than with the stocker.
So what was the down side? Honestly, I found no down side to the Pro Circuit set up. There wasn’t one thing that I thought the stock system did better. Did the PC give me more low end RPM response? No, but it didn’t lose any. Past that, the Pro Circuit pipe/silencer exceeded the stock system in all categories. What about compared to the other systems I have tried? I would say that the Pro Circuit pipe/silencer has been my favorite so far out of all the others that I have tried. The PC system either met or exceeded stock power everywhere. That’s a win for me! Like I mentioned, I am not a huge two stroke guy, but this Pro Circuit system was a nice upgrade for me and my test rider Dallas Dunn. You can call Pro Circuit at 951 738 8050 to order yours before they are gone. Trust me, they will be gone quick and then you’ll be stuck waiting!
Second Opinion: Dallas Dunn
After installing the Pro Circuit Works pipe and 304 silencer on the 2025 KTM 250SX, the difference was immediately noticeable. Right from the first lap, the bike felt more responsive, with improved pulling power. The stock exhaust has a solid midrange but tends to fall flat on top, requiring an early upshift. It also lacks excitement coming out of soft corners. However, with the new Pro Circuit system, the power delivery felt much cleaner throughout the entire curve. The low-end hit was slightly stronger, while the midrange and top-end saw the biggest improvements. The overall sound was another standout feature—crisp, clean, and carrying a deep, aggressive bark that made the bike even more fun to ride. There’s nothing quite like the sound of a properly tuned 250 two-stroke, and this upgrade not only enhanced performance but also made every lap more enjoyable.
