It all depends on what yo want from your new exhaust. If you're trying to get more hp, the best thing to do is get new airpods, rejet the carbs and get a full new exhaust. If you just don't like the look of the stock, get a slip-on.
anytime you put a full exhaust on you NEED a power commander on a FI bike...plain and simplekaliton636 said:anyone with a zx6r fuel injection model, get slip on and a powercommander. I bought a full akrapovic system I gained hp and sound, looked good but lost too much torque for street use. its a race only application due to the larger headers. go with the slip on i am going back now to stock headers and slip on