Parts are available from www.racing-cars.com and so are the hop-ups, I don't believe there are many out at the moment but I believe that the Manic shares some common parts with the Havoc and all the upgrades are Havoc parts (wishbones, hub carriers etc).  What parts are you after exactly, having owned 3 Schumachers I can honestly state that their hop-up market is not as extensive as any HPI product?