I had a Honda 650L a few years ago that I put a pipe on and did some carb rejetting. It was running a little rich so I bought some of these. Every time I drilled a hole and stuck one in, it ran better. I ended up putting six of these in and it ran great. Every time you drill a hole and stick one in, it allows just a little more air into the box.Xclimation said:Saw this today and looked like an interesting idea.