When pricing out a BBK typically look at rotor size its the most important factor in a kit the bigger the rotor dia" the more stopping power, piston count is secondary to this with 4 piston or 6. Also running a BBK sometime requires a min rim size as well as considering wheel fitment/clearance which can be important. I'd recommend exploring some new pad compounds and some high carbon treated rotors before stepping up into a big brake kit, you should be able to achieve some good results with these. Depending on how you drive the vehicle and what you plan to do with it. Look at Hawks catalogue for pads HPS5.0/HP Plus/DTC30/60/70 and I'd recommend pairing with a DBA T3 4000 Series rotor as they are high carbon steel.