A3 Tdi 140 Q's

Hi there im new to this site so hello and i appologise if these question have already been asked over and over!

I have an A3 53' TDI 2.0L SLINE currently running at 185BHP i am wondering what other mods would be suitable its been rolling road remapped but thats it so far.

Can anyone reccomend a good induction kit and exhaust system to use but if the exhaust is a de cat will it effect the mot? are larger injectors an option on this car?
Also i feel my clutch maybe suffering as it sometimes judders on tick over- can anyone reccomend an up rated clutch system.

Many thanks all feedback appreciated!