MoBridge is a all or nothing affair. Which I am not at the point of going just yet My car is mine and paid off. 8 years full warranty. I plan on keeping it for atleast that long. I have a JL Audio HD 600/4 amp and would need to add another just to power in the factory speakers. Then I also have a JL HD 1200/1. That would mean I would be running three amplifiers in total. They are extremely efficient for the output.