There is no issue with your turbo. The only problem, you were expecting the same shove@1700 RPM. It's just feel easy with very mild turbo action & it is linear up-to 2200 RPM@whichever gear you are in other than 5th. Even in 4th gear@2200-2500 RPM, it takes off..!! It feels linear though in 5th but once you get into 2800-3000 RPM range, even 5th gear produces butterflies in stomach in 90HP:mrgreen:. Do clear your filter though if it has run over 10000 KMs. No washing etc. is required, just a violent burst of compressed air for 2-3 mins will do the job.