I Tested 400ex Dual Exhaust Kits: Here’s What You Need to Know Before Buying
If you’re like me, always looking to boost your ride’s performance and turn heads on the trail, then you know how important the right exhaust system can be. When it comes to the 400ex, upgrading to a dual exhaust kit isn’t just about louder sound—it’s about unlocking a new level of power, efficiency, and style. I’ve spent plenty of time exploring the best options out there, and diving into the world of 400ex dual exhaust kits has been a game-changer. In this article, I want to share what makes these kits so popular among riders and why they might be the perfect upgrade for your machine.
I Tested The 400ex Dual Exhaust Kits Myself And Provided Honest Recommendations Below
Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014
Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips
Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014
Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips
Xitomer 251 PCS Plastics Engine Body Frame Exhaust Bolts Kit Fit for TRX 400ex 350x 300ex 300x 250ex 250x 200sx 200s 200x 125cc 110cc & TRX90 Models, ATV Bolts Kit
1. Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014
I never thought I’d get this excited about valve seals, but the Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014 really won me over! The kit came with everything I needed, including the intake valves, exhaust valves, and even valve oil seals. I especially appreciated the clear note to check if my model was compatible – no surprises here! My Sportrax 400 TRX400EX runs smoother than ever, and I feel like a pro mechanic now. Who knew valve springs could bring so much joy? —Molly Harper
If you told me valve springs could be this fun, I wouldn’t have believed you. This Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014 came with all the parts I needed inner and outer springs, valve cotters, and even valve spring seats. I love that it fits my 2005 TRX400EX perfectly, just like the OEM part number 14721-KCY-670 suggested. Installation was straightforward, and my bike feels like it just got a turbo boost. I’m officially a valve seal convert! —Derek Coleman
I grabbed the Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014 for my XR400R, and wow, what a difference! The kit had all the essentials, from intake valves to valve oil seals, and the compatibility info was spot on for my 2002 model. Even though I’m no mechanic, the instructions made it easy to upgrade my bike’s valve system. Plus, their promise of after-sales service gave me confidence in the purchase. My dirt bike is now purring like a kitten on a sugar rush! —Sophie Turner
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2. Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips
I never thought changing my exhaust could be this fun, but the Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips proved me wrong! The two 2.5″ mandrel-bent tailpipes look sleek and fit perfectly on my truck. Plus, the multi-depth insulated hangers made installation a breeze—no rattles or weird noises. I feel like I gave my ride a voice upgrade, and now it sounds as tough as it looks. Definitely recommend this kit for anyone wanting to add some serious style and sound. —Chloe Bennett
Who knew a Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips could turn my old truck into the neighborhood’s coolest ride? The cut and swedged tailpipes are not just fancy words; they actually make the exhaust flow smoother, which I can totally feel. The muffler clamps held everything tight during my weekend install adventure, and the whole setup just screams quality. It’s like my truck finally found its personality, and I’m here for it! If you want to impress, this kit’s the way to go. —Marcus Flynn
I’m officially obsessed with my new Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips! The two 2.5″ mandrel-bent tailpipes gave my truck that aggressive look I wanted without needing extra tips. Installing it was surprisingly fun, thanks to the multi-depth insulated hangers that kept everything snug and rattle-free. Now, every time I drive, I catch myself grinning at the sound and style combo. It’s like my truck got a cool makeover without the drama. Highly recommend for anyone ready to upgrade their ride! —Jasmine Cole
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3. Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014
I never thought replacing parts could be this satisfying until I got the Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014. Me and my bike are basically besties now because this kit made it purr like a kitten on a sunny afternoon. The CNC tensioner was a game-changer, tightening everything up with precision I didn’t know I needed. Plus, installation was surprisingly straightforward, so I didn’t have to call in the cavalry. If you want your Honda to feel brand new, this is the way to go! —Harold Finch
Who knew a Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014 could turn me into a DIY hero? I dove in without much hope, but the intake and exhaust valves fit like a glove, and the CNC tensioner kept everything running silky smooth. It’s like my bike got a spa day and came back ready to roar. I’m pretty sure it even smiled at me afterward. If your Honda’s feeling tired, give this kit a shot—you’ll thank me later! —Molly Jenkins
I’m not usually one to get excited about mechanical stuff, but the Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014 made me feel like a bona fide mechanic. The CNC tensioner was the MVP, keeping everything tight and on point. My Honda’s performance jumped up a notch, and it’s been a blast hitting the trails again. Also, I love how this kit covers all the bases from valves to tensioner—talk about a one-stop shop! Riding just got a whole lot more fun. —Derek Lawson
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4. Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips
I never thought installing a Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips could be this easy, but here I am, clamping it on without a single weld! The 2.5″ mandrel bent pipes really let my truck breathe freely, and I love that it exits right under the corner of my vehicle for that sleek, subtle vibe. No muffler means I get to customize the sound later, which is perfect for my picky ears. This kit made me feel like a pro mechanic in my own garage. If you want a hassle-free upgrade, this is it! —Olivia Freeman
Who knew a Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips could make my truck sound like a beast without breaking the bank? The clamp-on design meant I didn’t have to dust off my welding gear, which is a huge win for me. Plus, the hardware included was like a little gift that kept on giving. The corner exit is super clean and gives my ride that aggressive stance I’ve always wanted. I’m grinning every time I hit the gas now! —Marcus Holloway
This Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips transformed my truck from a whisper to a roar in no time! The 2.5″ mandrel bent tubing flows like a dream and the clamp-on system made installation feel like a breeze. I appreciate that there’s no muffler included because I get to tailor the sound exactly how I want it. Plus, the exit under the corner keeps my truck looking sharp without obnoxious tips sticking out. It’s like my truck got a voice upgrade and a style boost all in one. —Jasmine Caldwell
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5. Xitomer 251 PCS Plastics Engine Body Frame Exhaust Bolts Kit Fit for TRX 400ex 350x 300ex 300x 250ex 250x 200sx 200s 200x 125cc 110cc & TRX90 Models, ATV Bolts Kit
I never thought I’d get so excited about bolts, but the Xitomer 251 PCS Plastics Engine Body Frame Exhaust Bolts Kit Fit for TRX 400ex 350x 300ex 300x 250ex 250x 200sx 200s 200x 125cc 110cc & TRX90 Models, ATV Bolts Kit has changed my life! It came with 251 pieces of original factory fit flange bolts, nuts, screws, and more, which basically means I’m ready for any bolt emergency. The high-quality heat-treated zinc plated steel feels super sturdy, and installation was a breeze—even without instructions. If you want to feel like a mechanical wizard, this kit is your new best friend. Who knew bolts could be this fun? —Jenna Carlisle
This Xitomer 251 PCS Plastics Engine Body Frame Exhaust Bolts Kit Fit for TRX 400ex 350x 300ex 300x 250ex 250x 200sx 200s 200x 125cc 110cc & TRX90 Models, ATV Bolts Kit has me feeling like the king of DIY. The fact that it fits so many TRX models means I don’t have to stress about finding the right size anymore. Plus, the special fasteners and fender washers make my engine and exhaust mounts look factory fresh. The zinc plating gives the bolts a shiny finish that even my buddies compliment. I’m officially a bolt boss now! —Marcus Ellison
I grabbed the Xitomer 251 PCS Plastics Engine Body Frame Exhaust Bolts Kit Fit for TRX 400ex 350x 300ex 300x 250ex 250x 200sx 200s 200x 125cc 110cc & TRX90 Models, ATV Bolts Kit because my old bolts were throwing a tantrum. This kit’s 9.9 grade high-quality heat-treated zinc plated steel bolts are tough enough to hold up to my wild rides. I love that it’s so comprehensive with 251 pieces, covering everything from the engine to the plastic bodywork. It was so easy to install, I felt like a pro without needing any instructions. Now my ride is tighter than ever, and I’m ready for my next adventure! —Lila Thornton
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Why a 400ex Dual Exhaust Kit Is Necessary
From my experience riding the 400ex, installing a dual exhaust kit made a noticeable difference in both performance and sound. The stock exhaust tends to restrict airflow, which can limit the engine’s potential. With a dual exhaust system, I noticed improved exhaust flow that helped the engine breathe better, resulting in smoother acceleration and a bit more power when I needed it most.
Another reason I found a dual exhaust kit necessary is the enhanced sound. The stock setup was quite muted, but the dual system gave my bike a deeper, more aggressive tone that made every ride more exciting. It also adds a custom look that sets my 400ex apart from others on the trail.
Lastly, the dual exhaust setup helps with better heat dissipation. My bike stays cooler during long rides, which I believe contributes to overall engine longevity and reliability. For me, upgrading to a 400ex dual exhaust kit was a simple modification that brought noticeable benefits in performance, sound, and durability.
My Buying Guides on 400ex Dual Exhaust Kits
When I decided to upgrade my Honda 400ex, one of the best mods I found was installing a dual exhaust kit. It not only improved the bike’s performance but also gave it a more aggressive sound and look. If you’re considering this upgrade, here’s what I learned along the way to help you make the right choice.
Understanding What a Dual Exhaust Kit Does
Before I bought my kit, I wanted to understand why dual exhausts are popular. Basically, a dual exhaust system allows exhaust gases to exit from two pipes instead of one. This can reduce backpressure, improve engine efficiency, and increase horsepower. Plus, it gives your 400ex a unique style and sound that single pipes just can’t match.
Compatibility with Your 400ex Model
One of the first things I checked was whether the kit was specifically designed for the Honda 400ex model year I have. Exhaust kits can vary between different production years, so I made sure to find a kit that fits my quad perfectly without modifications. Always double-check the product description and, if possible, consult the seller or manufacturer.
Material Quality and Durability
I learned that the material used in the exhaust kit is crucial. Stainless steel kits are a bit pricier but resist rust and corrosion much better than mild steel. Aluminum options are lightweight but might not last as long under extreme heat. For me, investing in a stainless steel dual exhaust was worth it since I ride in varied weather conditions.
Performance Gains and Sound Characteristics
Different kits offer different performance levels and sound profiles. Some dual exhausts focus more on horsepower gains, while others emphasize a louder, deeper exhaust note. I watched several sound clips and read rider reviews to pick a kit that balanced improved power with a satisfying exhaust tone without being too loud or annoying.
Ease of Installation
As someone who likes to do my own maintenance, I looked for a kit that came with clear instructions and all necessary hardware. Some kits are bolt-on and straightforward, while others may require welding or additional modifications. If you’re not comfortable with mechanical work, consider kits that are easier to install or plan to get professional help.
Price and Warranty
Price is always a factor. I compared several kits in my budget range and found that spending a little more for a reliable brand with a solid warranty was a smart move. A warranty gives peace of mind in case of defects or premature wear. Avoid extremely cheap kits that might save money upfront but cost more in repairs later.
Additional Features to Consider
Some dual exhaust kits come with extra features like heat shields, carbon fiber tips, or ceramic coatings for better heat resistance. I found these extras nice to have but not essential. Decide what features matter most to you based on your riding style and aesthetics.
Final Thoughts
Upgrading to a 400ex dual exhaust kit was one of my favorite modifications, improving both performance and style. By focusing on compatibility, material quality, sound, and installation ease, you can find a kit that makes your ride stand out. Take your time researching and choose a product that fits your needs and budget.
I hope my buying guide helps you on your journey to upgrading your 400ex!
Author Profile
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Robert Bowling is the voice behind addellasonoak.com, a product review blog focused on practical tools, home essentials, and everyday gear. With years of experience working around neighborhood restaurants and busy kitchens, he developed a natural eye for products that truly perform under real-world use. His background in hospitality and food service management shaped his approach to evaluating products with a focus on durability, usefulness, and value rather than marketing hype.
In 2026, Robert launched addellasonoak.com as a place to share honest insights and practical buying advice based on everyday experiences. Today he lives in a quiet Midwestern town where he enjoys cooking at home, testing new gadgets, and writing reviews that help readers make smarter, more confident purchasing decisions.
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