I only speak for myself and my setup, but I disagree that the overheating is "created by the selkirk system". It's caused by there not being a cooling system on my snowbike that can cope with all situation. That would be air-cooled radiators. In my case, I also have the selkirk and neither of these can cope with all the situations I encounter on a typical ride, but a tunnel cooler could. If I did not have the selkirk and, instead, bundled up the engine with any type of engine cover complete enough to keep out the snow in cold in deep powder, I'd run into the exact same situation; the radiators would not cope. I've already outlined the riding situation I'm talking about (the two main being riding whooped out trails where speeds are too slow for radiators to get enough airflow and during long up hill deep powder pulls where there is little powder cooling anything and again speeds are too slow for radiators to do anything). And, I don't want to cover, uncover, cover, uncover radiators and engine flaps off and on all day. Hence my interest in a C3 tunnel cooler and the topic of this thread. There are plenty of other threads to talk about why and when and how to wrap, protect, cover, engine and radiators, etc. so we might as well (me included) keep that chatter in those threads so this thread can focus on the C3 heat exchanger as most of us that are considering a tunnel cooler are already well versed in various engine covers, radiators covers, rear engine covers, wrapping heated bars, alternate setups (like the selkirk), etc. We must agree that all regions and rider experience vastly different conditions and it even comes down to riding style and terrain. So one size does not fit all. Some of us experience situations where a tunnel cooler would make our snowbike experience better.understandable, However they are trying to prevent the overheating which is being created by the Selkirk system .We found this to be the issue and none of our 60 builds have any heating issues, To be informative we need to identify the cause of the problem.