Looking to order a new MCS with pretty much all pkgs except nav. If ordering JCW engine upgrade, is it necessary to do brakes and suspension if already have the sport pkg? Also, would this selection change mileage that much as well as change much else about the car other than quicker? I am getting a 6 speed btw. Any advice is appreciated.
Thanks. Great forum and website. People here have been extremely helpful.

 

Necessary, no. When is enough, enough? Only you can decide that. It's best if you test drive the different options yourself. You do not have to do the JCW brakes nor suspension upgrades with the engine upgrades if you don't wish to.