You can ditch your original e46 M3 sliding calipers with their systemic flex and loose feeling and replace them with stiffer Wilwood’s SL4R units (4× 1.125” pistons) with the exact same piston area as the original M3 calipers. This will not change your original bias. You can also install SL4R calipers with larger 1.25” pistons for more rear bias.

Better pedal feel. Cheaper brake pads. All compounds available for the 7420 reference.

Adapting kit for SL4R calipers : 420.00$ cad

To order or to get more info, please email us at massivebrakes@gmail.com