It works great for me! I didn't pay any attention to the exhaust smoke, but the water streams are much better than stock!
One of the things I find interesting is that Rubini's Water Streams for SH3 actually look better than the SH4 ones, and that they only appear for a bit after the selected holes have actually dipped under the water, which means that in calm water you don't get them at all; whereas SH4's seem to be 'on' all the time. Yours are better in this respect - both in being lighter and more realistic, and they don't seem to have water running out of them every second.
I'd still like to see them look even more natural, but I think people have only begun to scratch the surface on this. In your case, though, it's a deep scratch. Good job!
