Looking into the m4 exhaust for an 09 ninja zx6r just a few questions about it. Is there a huge difference between the slip on and full system? Is a power commander nessesary for a slip on? Ive never riden on a track just street but I've heard you can actually lose power with a full system if it's not on the track cause the bike isn't running at high rpm's all the time. Last question, is a full system much louder than a slip on or different sounding? Talking about the GP mount.