[YolkyPalky]

Like others said, E93 will get smoked by almost any decent high performance car due to its extra weight (imagine 10 of the 45lb/20kg gym weight plates in the trunk of your car, that's how much extra weight you are hauling in an E93 vs E90/2).

Secondly, as others have also said, there's no replacement for displacement. Hard to beat 6.2 liter displacement with a 4.0 liter, there's just too much to overcome without spending loads of cash, and even then not sure it's really worth it as there will always be some other stock car that can smoke your ass.