I like the 4cyl/300 series; however, I cannot see how to get the larger brakes in concert with this build. If you go to the 400 series, you get BIG BRAKES. Suggestions......

 

Buy a P300 then do aftermarket brake upgrade.

 

You also get a beefier and heavier transmission on the P400 (ZF 8HP 70 series), to handle the higher torque. This necessitates the bigger brakes and it cannot use the 18 inch rims.

I specified an off-road version for my 2020 Defender, so ordered the P300 petrol in the U.S. (no diesel available !) to enable 18 inch rims. I do not need the big brakes for the torque the P300 outputs, I concluded.