So far I've had 3" Flowmaster exhaust (installed 40 series), SilverLine Camaro SS Tips , OBD-2 code scanner (Don't fool yourself, this is a must), replaced the starter , and a rebuilt 4L60E transmission tucked under. (These trannys are notorious for going out at around 100K miles.) Installed a Jet T-Stat , Jet Performance's Fan controller switch (triggers my fans at lower temps) an extra 5 hp boost trick. Changed out her O2 sensors and did her tune-up. She purrs like a kitten. But her acceleration roars like a BEAST !