Yea just the 400 watt works pretty well but that doesn't mean the warm air intake won't help too. When I start the engine cold after using the block heater the coolant is warm but the intake air temp is still chilly so I imagine that could work against us. I was thinking today about fabricating a sheet metal case that would attach( maybe be welded to) from the converter and have a fitting to a hose going to the airbox
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