I am not sure what the "electric one" does. The two exhaust brake activations I have seen are either vacuum or air pressure. My exhaust brake is a butterfly valve (choke like) in the exhaust. It is open until activated. When activated it blocks exhaust (ONLY WHEN NO Throttle is activate) helping to slow down the vehicle. It works best at High engine RPMS. The term much cheaper is unknown. What do you consider cheaper. My system was over $1500 with installation by the dealership. I guess we need more information to help answer the question.
I am cautious when I see something real cheep. I feel you get what you pay for but again that does not always work in this RV environment.
Cheers,
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