I personally recommended
U4064 C/F Long Top Deck Flex,
world mod lower suspansion block,
front double joint universal,
and a properly built SpecR gear diff for tuning.
stock top deck made the chassis too stiff for my liking, had hard time tuning the car for my local track and my driving style. I notice that after driving a T4, switched the topdeck made the car much better but I still moved on to T4 after a whole year of abusive driving. my schumacher wear out too much and cost almost a car to repair.