I'm doing the intercoolers this week. My understanding is that it is good for the car, no cons at all. Just gives the engine cooler air to breathe.
There is a thread on it in here. I think joe@ptech is the only other forum member with stage 4 so you could reach out to him as well.
2012 550i M Sport Jet Black
Dinan Stage 4, Meisterschaft EV Controlled, Vorsteiner Aero Kit, Vossen CV3's, KWV3's, Blacked out little parts, JL Audio 10W7 in the boot