Skull is right. The best places for hopups are rdracing and rc-parts. As long as you break in the engine per the instructions you'll find the engine is sweet with very few tuning issues. The rear shock tower and bulks were the first to go on mine right after I burned out the tires on pavement during break in and had to replace those. It is extremely fast and hard to control at first but you'll get the hang of it. You might want to rebalance it a bit for huge jumps (over 10ft) otherwords it's all good. This truck has been hours and gallons of fun. I had to replace my 2.5 after a nasty incident with a f150 but all is well now. Oh yeah ssracing and neweramodels also make parts/hopups for it.