You don’t really need 300mm discs.
The standard solid discs are fine for road use.
In Good Condition.
Lots of people go on about they really need ‘updraded’ brakes, when really, what they have are in poor condition.
I’m changing from solid 286 to vented 300 because I’ll be using the car on track. I trail brake, (brake later deep into the corner), and left foot brake at times. It’s Really hard on brakes, there’s a lot of heat needs dissipated really quickly.
If I were keeping it as a road car I wouldn’t bother, they’re fine.