Worth every penny.
I bought this for the 400ex. After I bolted it on and properly jet it. My ATV was ripping, there was definitely an increase in power, It would accelerate faster almost ripping my arms off. Overall the product looked awesome, I just wished they put a metal label instead of the sticker, but it still looks awesome. The finish is really top notch. I just had a problem with bolting it on, I had to drill another hole on the bracket to make it fit on my ATV other than that there was no problem. This exhaust also doesn't need a gasket, just tighten the T clamp and you're good to go. There were also 2 other inserts you can use, mine had the largest insert already bolted for maximum power. If you have sensitive neighbors I suggest you use the other inserts because this thing is loud! You'll be expecting a lot of them knocking at your door.