I am not completely sure of the exhaust pressure on that bike check you owners manual, The normal idling rpm for the bike would be around 900 to 1100. this can be adjusted by adjusting the idle fuel control knob. do this only after the bike is warm enough. Regarding the turbo, you can definitely install a turbo on it. I would personally never put a turbo on such engines, there are plenty of chances that you could keep blowing the head gasket, hurt the intake, hurt the carbs. Keep in mind that you will have to change a lot of parts like the carbs vacuum lines and a lot. I definitely dont trust the engine blocks on these bikes ( BAJAJ)