I bought a #2 Magnum top end for my Maxi project. I wanted to know what you all think of them. How do they compare to the stock Puch top end? Will it give me more power? I plan to buy a Bullet exhaust for it.What do I need to do to use it on the Magnum cylinder.Please be specific. I may eventuall port match but for now I may just run it.Will the Magnum cylinder work ok with a 15mm carb.Will I need to change gears?