The BT-4 is a solid performer for the price and getting parts for this car have not been that big of an issue because we have a consolidated list on this site in the BT-4 thread. You can get the hop up parts from Team C which is currently stocking their US warehouse with parts for all their RC Cars. The BT-4/ TR10 with hop ups is the TC10. You can come to Ho-B RC Park in Durham, NC to run on road to. Mark C. have been there several time to race with us well so a lot of driver from the Queen city area.