Ichiban

my car also cuts under hard acceleration, only on high boost and in 3rd+4th my EP82 is standard apart from a full decat exhaust (2.3/4" all the way) and a HKS filter oh, and HKS plugs i have my cable converter and i am waiting for my dials to arrive, how and where do i get the certificate to say it covered its said km's? i will be fitting the parts myself as i am a mechanic but does the car have to be re-sva'd?