Well I don't think that there is a specific answer for the question. If you want the ideal weight, that is to be lighter than stock. So to achieve that, you would need to replace the parts that you want to replace with parts that weigh less. The heavier the truck is, the slower it will be. What you have to decide is, will the part that you're adding justify the added weight, such as will the durability of these arms out weigh the decreased power to weight ratio.