WELL I DONT KNOW WERE TO START ON THIS ONE. WHEN THIS BIKE WAS PURCHASED BRAND NEW THE OWNER HAD THE SUPERCHARGER INSTALLED THE DAY HE TOOK DELIVERY. WE HAVE SEVERAL DYNO SHEETS FROM OVER THE YEARS SO IT IS TWEEKED TO THE T. SEVERAL YEARS AGO HE DECIDED TO INSTALL NOS TO COMPLETE THE PROJECT. THE SIX INTO SIX EXHAUST SOUNDS LIKE NOTHING I HAVE HEARD BEFORE. IT STARTS ON THE FIRST TRY AND RUNS LIKE A STOCK VALKYRIE - UNTIL YOU PULL THE TRIGGER THEN THAT IS A DIFFERENT STORY! OUR CUSTOMER WAS THE ORIGINAL OWNER AND WAS AS DOCTOR AND RETIRED PILOT. NEEDLESS TO SAY HE WAS EXTREMELY OCD AND STAYED ON TOP OF EVERY SERVICE AND HE GAVE US HIS DOCUMENTS AND IT IS 5 INCHES THICK. COME BY AND CHECK THIS MONSTER OUT! I DON'T EXPECT THIS TOO BE AROUND LONG SO DON'T WAIT.