I'm thinking of buying Winner Power (WP Pro)/big brake kit. I contacted them and they said that they don't make rear brakes for an s4 as there aren't enough orders for them to be profitable. The ones on LLTek that are crossdrilled and slotted are the older version and do not work as good as their new crossdrilled ones...

Is it possible to fit 14" on the front and rear, and have a custom brake master cylinder? Can anyone shed some light on this for me?