Hi Guys, I pick up my new Zed tomorrow. Obviosuly i'm not in any desperate rush to change the stock exhaust. However, I like to plan ahead. So i've seen a full system Japspeed K4 for £500 obvs not fitted. That sounded like a good shout to me, just wondered if you guys know anything about the K4. Alot of Zed owners have the K1 & K2's. Anybody know the dofferences or maybe another recomended systems? Budget around the £500ish mark.