You can NEVER go wrong with a big three upgrade-one of the most ignored but important upgrades necessary when building a sound system. The engineers are getting worse and worse about putting smaller guage wiring under the hood now that so many items in the car use less electrical power (solid state relays, microchips, data based controllers, etc). But, amps are still the same power hogs they were many years ago and require a boost in available electrical power over what the factory system will provide without problems.