im confused here guys and anyone shed any light... i was just browsing courtenay's website when i came across this mod
Cavalier & Calibra Turbo 2.0i 16v (upgrade)
(includes engine decompression to facilitate the use of regular unleaded)
Remap +35 bhp
now i do use super unleaded but when im not bothered to drive down to the nearest stockist i just use normal unleaded.. will that harm my engine in anyway????