The Yamaha Curtis 325-Amp Controller from Buggies Unlimited is what we consider the stock replacement. However, it is more potent than the one that came in your golf cart from the factory. The original unit was usually a 200-300 amp affair depending on the model. This is good enough to push a caddie with two riders around a course for about three years. Then it is going to give up the ghost. The way we use our golf carts these days are way beyond that capability. Even if you are only ferrying the kids to and from school or the park.The golf cart Curtis 325-amp controller from Buggies Unlimited supplies the power from the batteries to the motor. This unit does not require that you upgrade any other components. However, if you go any larger, everything under the sun needs to be upgraded. As a matter of fact, you will need to swap even the cables, solenoid, and forward and reverse switch for heavy-duty replacements. However, all of the OEM equipment will work great with this unit. If you do need replacements, go ahead and get the heavy-duty versions. They will last much longer and cannot hurt the other factory Yamaha parts.We all love to get a great deal on what we need. But very seldomly does that offer come with everything we throw down. You will always get a quality product when you order from us. That is why we have the warranty we do. Our sales reps are eager to help and get you the best deal they can. If you need help with installing this Yamaha Curtis 325-amp controller, call an expert here at Buggies Unlimited. We would be happy to help you get the information you need to complete this golf cart upgrade quickly.