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how is it at keeping out water?

We had one on a Ford cabover that was used in the mountains of Southern Cal. It was really great. It had more holdback than an engine exhaust brake. You could drive that thing down the hill like a sports car.

After reading the posts here I ordered the Hyper-Tech to use on my Powerstroke 7.3l engine. Wow,what a difference! The biggest problem I've had is trying to tow a trailer with two large Jeeps on it up over the Eisenhower Pass and also the Vail Pass on I-70 west of Denver when the outside air is...