[Psycho]

Well said Rtech

However critical mods to the car other than the engine typically include (depending on the limit of mods) braces (strut and lower) sway bars, modded suspensions, better engine mounts, better suspension bushes (have been using teflon in extreme cases, trying to get down the full bush kits soon), Upgraded brakes ( boosters, discs / drums where required), modding the brake bias. They play a critical aspect in keeping the car together and performing to its best in every condition.