I haven't had a chance to confirm if there are any differences, but the PCV on the GDi 3.8 from the Gen Coupe is on the rear of the passenger side valve cover. Adding a properly routed catch can should not void your warranty, just make sure it is a sealed can and not vented, as the PCV needs vacuum to function properly. If there is any question on your dealer flagging your warranty, simply remove it before you take it in for any service.