The red will work to a much higher HP in a boat than a car. Tanks next to motor, not pushing against the G forces on launch, much less heat soak than a car, etc. Never been stuck by a mechanical pump, but have been walking/ swimming 5 or 6 times with an electric in the last 35+ years. I run a Blue at 785 HP with no issues, but until I replace it with a mechanical and reinvent all of my brackets(its an I/O deal), I carry a new spare with the A/N fittings installed and a plug-in wiring deal. When the last electric pump failed last season, it cost me a ride up on the rocks from the wind, 12 hours of bottom work, and a prop rebuild. I also carry a spare regulator, also with fittings, the Hi-vol mechanical is a better deal, no regulator either. Your results may vary. TIMINATOR