Reccomended 87. I put 90+ in it, and I do notice a difference, that is, no more pinging at high rpm.
"My family hauler can kick your family hauler's @SS!" ~~~~1999 Contour SE Sport~~~~ -KKM True Rev -Custom cat back Flowmaster exhaust -All Cat's fixed. -SHO Shop Off-Road Y-pipe -Many other Mod's done...