Here is the deal.
The puch biturbo is one piece
The tomos biturbo comes in two varieties.
The 1 piece with is for all tomos except colibri and revival(must be modified) that have the original cylinder.
The 2 piece is for those same models that have either the 60 or 70 cc kit. It has a larger diameter header and the pipe comes out at a much different angle that is needed on the speed kits as the exhaust port is on a different angle than the standard cylinder.