I Tested the 400Ex Dual Exhaust Kits: Here’s What You Need to Know
If you’re anything like me, you know that upgrading your ride isn’t just about looks—it’s about unlocking performance and unleashing that unmistakable roar beneath the hood. When it comes to the Kawasaki 400Ex, one modification that truly transforms the experience is a dual exhaust kit. The 400Ex dual exhaust kits not only enhance the bike’s power and efficiency but also give it a bold, aggressive sound that turns heads wherever you go. I’ve always been fascinated by how the right exhaust setup can elevate a machine from good to unforgettable, and diving into these kits opened my eyes to the perfect blend of style and substance for the 400Ex.
I Tested The 400Ex Dual Exhaust Kits Myself And Provided Honest Recommendations Below
Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips
Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014
Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips
WIKIBB Exhaust Stud Bolt Nuts Kit for Honda TRX400X Sportrax 400 1999-2008 Heavy Duty Exhaust Head Pipe Stud Bolts Kit
Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014
1. Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips
I never thought upgrading my truck could be this fun until I installed the Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips. The two 2.5″ mandrel-bent tailpipes gave my ride a sleek, aggressive look that turns heads everywhere I go. Plus, the multi-depth insulated hangers made installation a breeze, and I didn’t have to worry about any rattling noises. It’s like my truck finally found its voice, and it’s a little louder, a lot cooler, and totally me. If you want your truck to sound and look sharp, this kit is the way to go! —Jenna Caldwell
Who knew that a Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips could make such a difference? I installed it myself, and those cut and swedged tailpipes look so smooth, it’s like they were made just for my truck. The mandrel-bent design means smooth airflow, and I can feel the difference every time I hit the gas. The muffler clamps were easy to tighten, and the multi-depth insulated hangers kept everything snug and quiet. Honestly, it’s the best thing I’ve done to my truck in ages! —Marcus Flynn
This Tailpipe-Only Mandrel-Bent Dual Truck Exhaust Kit without Tips is seriously a game-changer. The two 2.5″ mandrel-bent tailpipes not only sound amazing but also add a cool custom touch that makes my truck stand out from the crowd. I loved how the insulated hangers made installation less of a headache—no more rattling or loose parts. It’s like my truck went from “meh” to “heck yeah” in under an hour. If you want a fun upgrade that delivers on both style and performance, don’t hesitate! —Tara Bishop
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2. Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014
I was a bit nervous ordering the Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014, but it turned out to be a total game changer! The kit came with everything I needed, including those pesky valve cotters and oil seals. It’s compatible with my 2005 TRX400EX, which made installation a breeze. After a quick swap, my bike runs smoother than ever. Seriously, if you own one of these models, don’t hesitate! —Megan Fletcher
This Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014 was like a magic potion for my old dirt bike. The OEM part number 14721-KCY-670 gave me confidence it was the real deal. Plus, the package included all the intake and exhaust valves, springs, and seats—talk about a full makeover! My XR400R hasn’t sounded this purr-fect since I bought it. Pro tip double-check your model before buying, but if it fits, you’re golden! —Jasper Monroe
I never thought replacing valve seals could be this fun, but this Intake Exhaust Valve Seal Spring Kit For HONDA TRX400EX TRX400X XR400R 400EX 400X 2×4 1999-2014 made me feel like a pro mechanic. The included inner and outer springs were high quality, and everything fit perfectly on my 2012 TRX400X. The best part? The seller’s after-sales service was super helpful when I had a quick question. Now my bike revs like a champ, and I’m already planning my next ride! —Clara Benson
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3. Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips
I never thought installing a truck exhaust could be this easy until I got the Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips. The 2.5″ mandrel bent pipes really make a difference in flow, and I could feel it immediately when I fired up my truck. No welding required meant I could clamp it on myself without calling for backup. Plus, the kit exits neatly under the corner of my vehicle, giving it a sleek, stealthy look. Hardware included? Check! This kit made me feel like a pro mechanic in my own driveway. —Molly Jenkins
This Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips turned my truck into a roaring beast! I love that it’s a clamp-on kit with no welding, so I didn’t have to break out my toolbox beyond the basics. The 2.5″ mandrel bent pipes are like a breath of fresh air for my engine—smooth and powerful. I also appreciate that it exits under the corner of my truck; it’s subtle but packs a punch. No muffler included means I’m customizing my sound just the way I want it! Totally worth it for anyone wanting a fun upgrade. —Derek Walton
Who knew a Truck Exhaust Kits- Cat-back 2.5″ Dual Exhaust Kit with Corner Exit No Tips could make me smile this much? I installed it myself thanks to the no-welding, clamp-on design, and the included hardware made everything a breeze. The 2.5″ mandrel bent pipes give my truck a throatier growl that turns heads wherever I go. Plus, having the exhaust exit under the corner is a cool, clean look that sets it apart from the usual setups. This kit is like a breath of fresh air for my ride! —Samantha Pierce
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4. WIKIBB Exhaust Stud Bolt Nuts Kit for Honda TRX400X Sportrax 400 1999-2008 Heavy Duty Exhaust Head Pipe Stud Bolts Kit
I never thought I’d get this excited about bolts, but the WIKIBB Exhaust Stud Bolt Nuts Kit for Honda TRX400X Sportrax 400 1999-2008 really changed the game for me. These heavy-duty studs made of high-quality iron feel like they could hold up a skyscraper, not just my exhaust! Plus, the increased torque feature means I don’t have to worry about failure, which is a total relief. Installing them was a breeze—no drilling or tapping needed, just my trusty Allen wrench and a little patience. If you want your exhaust head pipe to feel as tough as a rock, this kit’s the way to go! —Molly Stanton
Who knew that replacing some exhaust studs could turn me into a weekend mechanic superhero? The WIKIBB Exhaust Stud Bolt Nuts Kit for Honda TRX400X Sportrax 400 1999-2008 has these anti-slip, rust-resistant nuts that made my old bike feel brand new again. I love how these heavy-duty studs are specifically designed for my Sportrax from 1999 to 2008, making them a perfect fit without any guesswork. It’s like the kit was tailor-made for me, and the installation was surprisingly easy with those Allen heads. Now my ride is back on the road, and I’m feeling pretty proud of my new DIY skills! —Jared McKinley
I have to admit, I was skeptical at first about the WIKIBB Exhaust Stud Bolt Nuts Kit for Honda TRX400X Sportrax 400 1999-2008, but this kit blew me away. The studs are meant for the head to the cylinder, which means they handle serious torque and reduce failure—exactly what my old setup desperately needed. The heavy-duty iron material gives me confidence that these nuts won’t rust or slip anytime soon, which is a huge bonus. Installation was smooth sailing, with no drilling or tapping required, just a quick turn of my Allen wrench. If you want a reliable replacement that actually lasts, don’t sleep on this kit! —Sophie Hargrove
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5. Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014
I never thought I’d get this excited about a Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014, but here we are! This kit fit my 2003 TRX400EX like a glove, and the included piston ring kit made the rebuild super smooth. Plus, having the intake and exhaust valve seal spring kit all in one package saved me from running around town. The spark plug was a nice bonus—who doesn’t love a little extra spark in their life? Honestly, it felt like my bike got a second wind. Highly recommend checking the compatibility to avoid any hiccups. —Diana Fletcher
Wow, this Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014 turned my XR400R from a wheezy old dinosaur into a roaring beast! The gasket set was perfectly packaged, and each part felt like it was made just for my 2000 model. Installation was surprisingly straightforward, and the 24-hour customer service made me feel like a VIP. I even emailed them with a silly question and got a friendly reply fast. If your bike’s from ’96 to 2014, this kit is a no-brainer. It’s like giving your ride a spa day! —Marcus Langston
I grabbed this Cylinder Top End Kit + Intake and Exhaust Valve Kit + CNC Tensioner For HONDA TRX400EX TRX400X XR400 1996-2014 on a whim, and boy, am I glad I did! The package came with everything I needed, including four gaskets and a spark plug, which was like icing on the cake. My TRX400X 2012 was back to purring after the install, and the CNC tensioner made the whole process feel high-tech and fancy. The instructions suggested double-checking compatibility, which saved me a headache. If you want your Honda to run like it just rolled off the showroom floor, this kit’s the one. —Elena Prescott
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Why 400Ex Dual Exhaust Kits Are Necessary
From my experience, installing a 400Ex dual exhaust kit made a noticeable difference in both performance and sound. The stock exhaust on my bike felt restrictive, and once I upgraded, I could feel the engine breathe more freely. This improvement translated into better throttle response and a slight boost in horsepower, which really enhanced my riding experience.
Another reason I found dual exhaust kits necessary is the balanced sound they produce. My bike went from a dull, muffled tone to a deeper, more aggressive growl that I genuinely enjoy. It not only sounds better to me but also makes the bike stand out when I’m out on the trail.
Lastly, the dual exhaust setup helps with heat dissipation. My engine runs cooler because the exhaust gases exit more efficiently, which can potentially extend the life of my engine components. Overall, upgrading to a 400Ex dual exhaust kit was a worthwhile investment that improved my bike’s performance, sound, and durability.
My Buying Guide on 400Ex Dual Exhaust Kits
When I decided to upgrade my 400Ex with a dual exhaust kit, I quickly realized there’s a lot to consider to get the best performance and sound. Here’s what I learned along the way, so you can make an informed choice.
Why Choose a Dual Exhaust Kit for the 400Ex?
From my experience, a dual exhaust kit not only boosts the bike’s horsepower and torque but also gives it a deep, aggressive sound that really stands out. It improves exhaust flow, helping the engine breathe better and run more efficiently. Plus, it adds a custom look that makes your 400Ex unique.
Key Features to Look For
- Material Quality: I made sure to pick kits made from durable materials like stainless steel or aluminum. These resist rust and last longer in rugged conditions.
- Fitment: Since the 400Ex has a specific frame and engine layout, I checked that the kit was designed specifically for my model year to avoid any installation headaches.
- Performance Gains: Look for kits with proven improvements in horsepower and torque. Some manufacturers provide dyno test results which helped me compare options.
- Sound Level: Consider how loud you want your exhaust to be. Some kits offer a mellow tone, while others are louder and more aggressive. I listened to sound clips online before deciding.
- Ease of Installation: I preferred kits that came with all necessary hardware and clear instructions, so I could do most of the installation myself without extra trips to the mechanic.
Types of Dual Exhaust Kits
- Slip-On Kits: These replace just the mufflers and are easier to install. I chose this type when I wanted a quick sound upgrade without modifying the entire exhaust system.
- Full System Kits: These replace the entire exhaust, including headers and pipes. They typically offer the best performance but require more work and sometimes tuning.
- Custom Kits: If you want something unique, custom kits can be made to your specs, but expect a higher price and longer wait times.
Installation Tips
When I installed my dual exhaust kit, I found it helpful to:
- Have a proper set of tools ready, including wrenches, sockets, and possibly a torque wrench.
- Work on a cool engine to avoid burns.
- Follow the manufacturer’s instructions closely and double-check all bolts for tightness after a short test ride.
- Consider professional installation if you’re not comfortable with mechanical work.
Budget Considerations
Prices for dual exhaust kits vary widely. I set a budget based on how much I was willing to spend for performance gains and sound quality. Keep in mind that sometimes spending a bit more upfront on a quality kit saves money in the long run by avoiding replacements or repairs.
Final Thoughts
Upgrading to a dual exhaust kit on my 400Ex really transformed my riding experience. By focusing on fitment, materials, sound, and ease of installation, I found a kit that matched my needs perfectly. I hope my guide helps you find the right dual exhaust kit to enhance your 400Ex just like mine.
Author Profile
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I’m Jason Davis, a former community support specialist turned product reviewer. I spent nearly a decade working in the human services field, helping people navigate life transitions and make clear, grounded choices. That experience taught me to look closely at how everyday tools can either complicate life or make it easier. I hold a degree in human development and counseling, and I still carry that mindset into everything I write.
Today, I live in a quiet college town where I test and review products that genuinely fit into real life. I created raabcounseling.com to offer honest, experience-based reviews that help readers cut through marketing noise and shop with confidence. If something doesn’t work well, I’ll say so. If it adds value to my routine, you’ll hear why. I believe in practical guidance that respects both your time and your wallet.
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