pinasco exhaust

hello,

i have a vespa sprint/gt125 with a PX125 motor.

 

and i am confuse with the pinasco exhausts.

why the pinasco art:40308100 have 2.900kg and the art:40308300 have 4.000kg?

 

which of this i have to buy. the one for sprint or for PX.

some people told me that the exhaust touches the mainstand and needs new holes to put him further ahead. is it true?

 

which one is the correct for my bike?

remember that i have a vespa sprint with a PX motor

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