Hey dude
Honestly it would be better for your engine to use the 24 si carb. for the PX200, the mainjet is 120-118.
Regarding the exhaust question.
If you prefer a low noisy pipe with a good performance i recommend you you the SIP0810.
If you want a race pipe in stainless steel with more power and more noise you could use the SIP Performance but for your setup this pipe would be the 2. choice.
By the way do you still have this 177DR Cylinder ??
Better would be the 177 Pinasco.
cheers