Boost bottles and superchargers both fall into the category of snake oil and are a waste of money. They both add weight and at best do next to nothing, nothing at all or at worst shorten the life of your engine. Follow everyone in this posts' advice and spend that money on something else, like a better engine or tires. At least the weight they add is offset by a boost in performance. It is hard to believe these items are still available on the market, (the supercharger is still on the upgrades page for the MT2 on Tower's site) I guess as long as there is money to be made they will be around. Good thing there are helpful people like those here on RC universe to inform others not to waste their cash on these worthless items.