Acs is ridiculous, i phoned them when i had my 135, jose who does not work there anymore said it is +-170k if i can rmember, but i think thats kit and rims, its all a package deal plus i think power is 265kw which you can get 5-10k from excede or chiplogic.
Dinan in sa will be cool, I dont think bmw keep the warranty, i think dinan has there own warranty which is similar to bmw. Bmw dealers sell it. Chip and oil cooler.That would be peace of mind.