The cooling holes are not cut at the factory, the builder does that. To prevent that from happening, I didn't cut the holes in mine, I wrapped the cans in Header tape, keeps the heat in. Some guys say that's bad, but that's the way mine is, and works great
The other option is to completely enclose the exhaust compartment like the other brands are, real tough on the Comp-ARF. Or no smoke, if you notice the instructions on the Comp doesn't show a smoke system.
Tom