I just bought a factory jet kit and full stainless Muzzy hi- mount exhaust with ti canister. After searching for a shop with good mechanic and dynometer, the place I find says he does't want to see another Kawasaki ZX7R with a Muzzy system. The guy goes on to tell me that he just ran my same bike with a Muzzy for 80 hours on the Dyno and still couldn't get rid of the flat spot around 4000rpm. He went on to say that there are a couple a reasons for that including elavation differences between Cali (where Muzzy is??) and New York, where I am. He suggested I go with a Hindle or Akra, which were my other two choice but I already bought the Muzzy!!! The guy also said that the Muzzy's run better on the GSXR 750. What can or should I do??? Believe him or keep searching for another shop?? Thanks!!!