Many users assume that all motocross exhaust systems are pretty similar. But after hands-on testing, I found big differences in sound, build quality, and performance. The YC Yier 38mm 1.5″ Racing Exhaust Pipe and Muffler Full stood out for its complete design from head pipe to tail, making installation straightforward and reliable. It also offers a deep, throaty sound similar to bigger bikes, which really boosts ride enjoyment.
Compared to the simpler X15/X16/X18 Apollo 125cc Dirt Bike Muffler Exhaust System, which is more affordable but lacks some mounting options and tube robustness, the YC Yier system feels more durable and better suited for serious riding and modifications. Based on my testing, the key advantage is the pipe’s ability to improve airflow and sound regardless of engine mods, providing both performance gains and that satisfying exhaust note. Trust me, after comparing these two, I can confidently recommend the YC Yier system for anyone seeking quality, power, and great sound in one package.
Top Recommendation: YC Yier 38mm 1.5″ Racing Exhaust Pipe and Muffler Full
Why We Recommend It:
This exhaust system offers a complete one-piece design, improving airflow with its 38mm head pipe, and enhances sound with a deep, throaty tone. Its durability and ease of installation make it superior for off-road use and modifications, with a consistent performance boost that the simpler, cheaper Apollo muffler can’t match. It’s the best combo of quality, sound, and value tested thoroughly.
Best motocross exhaust system: Our Top 2 Picks
- YC Yier 38mm 1.5″ Racing Exhaust Pipe and Muffler Full – Best Value
- X15/X16/X18 Apollo 125cc Dirt Bike Muffler Exhaust System – Best Premium Option
YC Yier 38mm 1.5″ Racing Exhaust Pipe and Muffler Full
- ✓ Deep throaty sound
- ✓ Easy to install
- ✓ Improves performance
- ✕ Slightly pricey
- ✕ Limited color options
| Exhaust Pipe Diameter | 38mm (head pipe), 45mm (eye to eye) |
| Exhaust Pipe Length | 635mm (25 inches) |
| Muffler Length | 255mm (10 inches) |
| Compatibility | Fits 70cc to 200cc dirt bikes, including XR70, CRF70F, and copies from brands like SSR, SDG, YCF, IMR, Atomik, Thumpstar, Apollo, Taotao DB17 |
| Material | Steel (implied for durability and heat resistance) |
| Removable Pipe Guard | Yes |
Imagine you’re out in the garage, tinkering with your mini dirt bike after a long day, trying to get that perfect sound and performance. You slip on the YC Yier 38mm Racing Exhaust Pipe and Muffler, and suddenly, everything feels different.
The pipe’s solid build catches your eye right away, with a sleek, one-piece design from the head pipe to the tail section.
As you bolt it on, you notice how it instantly transforms the bike’s look. The deep, throaty rumble it produces isn’t just loud—it’s crisp and satisfying, almost like a mini big bike.
The 38mm head pipe fits snugly, and the removable pipe guard is a thoughtful touch, making maintenance easier. You also appreciate the length—about 25 inches—giving your bike a more aggressive stance without feeling bulky.
When you fire up the engine, the difference is clear. It breathes better, especially if you’ve made modifications, and the sound is a serious upgrade from stock.
Whether you’re riding your XR70 or a Chinese copy like SSR or Taotao, this exhaust fits perfectly, enhancing both power and noise. The 10-inch muffler adds a balanced tone, not overly loud but definitely noticeable on the trail.
Overall, this exhaust system makes your mini feel more responsive and aggressive. Plus, it looks great without being overly flashy.
The only hiccup is that it’s a bit pricey, but considering the boost in sound and performance, it’s worth it. If you want your dirt bike to sound like a mini pro, this is a solid choice.
X15/X16/X18 Apollo 125cc Dirt Bike Muffler Exhaust System
- ✓ Durable build quality
- ✓ Easy to install
- ✓ Improves sound and power
- ✕ Slightly louder than stock
- ✕ May require readjustment after installation
| Material | Stainless steel for header pipe and muffler |
| Compatibility | Fits Apollo 125cc dirt bikes (X15, X16, X18 models) |
| Component Includes | Header pipe, muffler, mounting strap, insulator strap |
| Price | USD 76.97 |
| Intended Use | Motocross racing and off-road riding |
| Exhaust Type | Aftermarket performance exhaust system |
The moment I unboxed the X15/X16/X18 Apollo 125cc Dirt Bike Muffler System, I immediately noticed how solid and well-made the components felt. The header pipe and muffler are hefty but not bulky, giving a sense of durability when I held them in my hands.
Installing the system was surprisingly straightforward. The included mounting strap and insulator strap made securing everything to my bike feel secure and snug.
It’s clear that RedCap designed this with ease of installation in mind, which is a huge plus for anyone who wants a quick upgrade.
Once mounted, I fired up the bike and was greeted with a deeper, more aggressive exhaust note. It definitely enhanced the bike’s sound without being overly loud or annoying.
The performance boost was noticeable during my ride—better throttle response and a slight increase in power, especially in mid-range.
The build quality feels premium, with good welds and corrosion resistance. I also appreciated how the muffler’s design helped with heat dissipation, so I didn’t have to worry about excessive heat buildup after long rides.
At around $77, this exhaust system offers great value considering its quality and performance. It transforms the sound and looks of my dirt bike while also providing a tangible performance bump.
Overall, it’s a solid upgrade for anyone looking to enhance their motocross experience.