You might want to rethink about keeping your backplates on your car to ensure that no pebbles get up in your timing belt. We already had a customer at our shop run with out covers and a pebble got into his timing belt and they rest they say is history. His motor blew up like a tickin time bomb. There is a reason Nissan put covers on the motor. To keep debris out and the timing belt safe. Id hate to see your motor that you are building up here blow up in your face because you decided not to run the timing belt covers.