Enkei "Performance" series will be hit or miss when it comes to weight, but yeah those wheels in 18" come in at 23lbs. Too heavy a wheel, especially since any tire except the stock Michelin will be adding additional weight as well - so you will be running a minimum of 4lbs a corner heavier than stock - not good!
EKM3 is 'meh' IMO (even # of 'spokes' that are positioned too close together):
If I was going for a heavy Enkei mesh wheel it would be the Lusso (in Enkei's Luxury Sport line), only 20.5lbs in 18x7.5 size and a better offset (+42 versus +45 of EKM3) with much better looks IMO:
P.S.
Tire Rack's FR-S wheels fitment