the 4 piston brembos on the SS are pretty good - more than adequate for the street and autox and even some track use with the right pads. Going to the 6 piston will improve the braking slightly and more importantly should reduce the brake fade. I have similar StopTech brakes on my 71 Pro Touring Camaro - ST60 / ST40 with 14x1.25" rotors and the stopping power with TW200 tires is simply amazing. Better than the SS for sure. Is that needed on the street? No way. I did it to make the car capable of full road course track sessions and I used to race with NASA in the CMC class about 10 years ago.
Anyway - brakes are expensive. The ST package on my '71 retails for more than $7K
But obviously the upgrade from stock '71 Camaro brakes to that is quite staggering. The upgrade from 4 piston to 6 piston brembos is a lot less of a step up.
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