Hey y’all, just wanted to start out by saying I’m thinking of buying a v6 mustang but wanted to know about tunes

I know there’s a lot of 91/93 tunes and even some 87 tunes, but are there any tunes for 89 octane?

also if I want it to go faster then what it’s limited to, can tunes override my topspeed aswell or do I have to have to the limiter taken off