You have one cooling line, the other is the bilge line to suck water out threw that box. To add dual cooling which is absolutely not needed, you would have to drill and tap a second pressurized fitting into the pump and run the line.
The water box is after the pipe and in front of your gas tank. On the SN it is fiberglass and boxy in shape. It acts as both a muffler and a way to keep water from going up the exhaust and into the engine.
Diverting water from the pipe means less water is injected into the exhaust stream to...
Aftermarket hulls tend to be shorter, and length of exhaust pipe will slightly affect noise levels. I run a protec pipe with H2o waterbox and my superjet is still not very loud especially compared to my old 650sx's with front exhaust.
I really like the flatwater turn ability of the superjet. Even my ex's SN with front tubbies felt like crap compared to mine, although ride plates were different. I've rode my buddies rickter. The light weight plus 900cc powervalve motor were overwhelming honestly. Plus wasn't that comfy going...
Converting is easy just some time cutting the mount to make it fit. RN pole is much better. Lighter, easy to shorten. My heavy duty square nose spring keeps my shortened RN pole at zero weight it just stays where ever I put it.
I see tons of people going with aftermarket hulls then running 701 or 701 based engines in them. I don't seem to see a lot of people stuffing big aftermarket engines into stock superjet hulls. I haven't rode an aftermarket hull that I like as much as the superjet yet overall, so its got me...
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