The stock intake manifold for the APtrikes 125 has an inner diameter of 19 mm, but this intake manifold has been enlarged to 26 mm.

It is designed to eliminate intake bottlenecks when a large carburetor is installed.

The flange on the carburetor side is offset 10mm higher than the stock intake manifold, which may resolve the size mismatch issue with a large carburetor.

Since it is designed to conform to the stock shape except for this 10mm upward offset, there is no need to cut the engine cover or struggle with the placement of the air cleaner box, and the risk of drawing in secondary air through multiple adapters is minimized.