What type of gas for an Acura Integra...?

he can use regular gas just fine if it is from a CRV if he does street race and there are a lot of engine mods then he can use like 89. there isnt a real performance gain from running higher octane if isnt required. higher octane just prevents knock on hotter running engines. anyway i also street race in my integra i use 89 when i do feel like racing and 87 when im just drving