You can add just the front 12in brakes and you would need the GM Brackets from the Oldsmobile Intrigue.They will help but since you are still using the single piston calipers they wount stop much better then stock.The best way to go is with the 12in rotors and the 98 up F-body aluminum dual-piston calipers, they will really increase the stopping power of our cars.
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~Larry~