HMF for Honda TRX 400EX 1999-2014 Slip On Exhaust | 019253606071

My son anxiously installed it on his 4-wheeler. Looks, and sounds, awesome! Better than expected!

It's loud...

I have installed this on my 2010 Honda Rancher with an HMF Optimizer (a necessity or else your ATV will run lean) and a K&N free flowing filter. The difference is night and day!!!!! I put the Rancher on a dyno and have at least 40% more torque and 30% more horsepower.The hardest part of my install was actually removing the old exhaust -- 3 12MM bolts (2 at the clamp and 1 at the back exhaust mount). Make sure you open the clamp all the way with a screw driver so it is loose -- otherwise you cannot take the exhaust off. I also sprayed the end of the exhaust where the clamp was installed with penetrating oil. Then TWIST the exhaust, don't pull immediately. It will come off (no need to take the heat shields off).Putting on the exhaust is just the reverse and isn't hard. I bought a 1010 Pelican dive case and mounted my HMF Optimizer on my right fender over the '16 year old and older' flat spot. Drilled out the side of the case to run the wires and used a lot of automotive goop (glue) to plug holes. That way I can watch the Optimizer while I ride.I have found the Optimizer settings to be fine whether I'm riding at sea level or in the mountains -- the engine ECM will automatically adjusts. We had to drop my the settings on my son's Rancher by 1 (Mode 1 became 1.5, 2.5 and 3) but his always ran rich from the factory.... No longer.Best money I've ever spent on my ATVs.... Again -- don't just get this. Need the K&N Filter and the HMF Optimizer as well.