Pran, I don't think the injectors would need cleaning yet. Also, the classic symptoms of injectors getting clogged is engine stumbling, misfiring etc. Plus, make sure the Bosch guys do CRDI injectors. They are very, very complex and require special equipment for testing and cleaning. Talk with TASS beforehand if you intend to do this. Since removal, refitting and bleeding of injectors( I'm not sure if Multijet injectors are self bleeding or not ) is no mean task. Try getting the intercooler and EGR valve cleaned thoroughly at TASS. Vijay Khasa recently got this done and reported a jump in performance. I'm sure it'll help efficiency also. Cheers.