18" Wheel help

The OP can make his own decisions, but I don't see the need for coil overs in this case (if ever?). He should be able to buy some 18x8 and/or 18x9 wheels that bolt on without having to change much at all beyond maybe swapping the rear axle, if that. Run a 245 or 255 tire in the front and I bet he doesn't even need to mess with the fender braces, if a Demon even has them.

I agree the small brakes can look funny, but an upgrade to bolt on 11.75" rotors is an easy and a worthwhile change. Paint the rear drum black and I suspect it will be fine.

@MopaR&D made it look pretty easy.

1970 Duster, Trans-Am-inspired "Pro Touring" build

Another "Will these fit?": 18" Mustang wheels

To be clear, that car is a Duster and Demons have a different front fender opening. Could be that the lower front corner interferes and needs trimming. Not really sure. But I know @BergmanAutoCraft runs a wide 18" tire on his Dart and I don't remember him saying anything about having to trim anything.