The mid pipe on the slip on is different than the full system. You cant add later to the slip on. I made 104.7hp with my full yoush system, and my budy made 105.7 with his full arata that was mapped on the same dyno. I don't see the big hype in the arata other that brand name. just my.02 See Nick at Ridersinc he usually has the best price on the full system.