I have an 83 5.8 which I upgraded to the NA package when it first became available. I was pleased with the results at the time. I later upgraded again to a spinnaker which I purchased from Brisbane Sails. At the time spinnakers class legal on the 5.8 in Australia so the spinnaker is designed for the 5.8 not an F18. My 12' spinn pole runs under the bridle foil and does not poke waves. Jib is now on a roller furler and I like the set up. BTW my first upgrade was a sq top main from Elliott/Pattison. All my jibs and mains have come from them.