del Sol brakes

I've noticed while in the market for performance brake discs for my car that, some of the brakes are for vtec models and the others are for the s models, i was wondering if anyone could explain to me why the size of my engine matters when choosing brakes, the only reason this bothers me is b/c atm i have a 1.5l s model engine but i have plans of replacing it with a dohc vtec engine and dont wish to purchase new brakes twice.

Often when the manufacturers upgrade motors, they also upgrade brakes by going to bigger rotors. For example for a 94 Del Sol the VTEC uses rotors of the following specs:

DIAMETER: 10.3"/262MM MIN THICK: 19.0MM

while the 94 Del Sol S uses rotors of the following specs:

DIAMETER: 9.4"/240MM MIN THICK: 18.0MM

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