Having a large intake manifold means little without the right petal block. This inexpensive racing petal block provides a clear path and greater flow rate. Rubber vulcanized fiberglass membranes seal much better than stock elements. Greater flexibility means greater responsiveness. Even when they fail, they cause significantly less damage than the original metal parts. Fits vertical engines Peugeot, Kymco, SYM.. Replacement membranes can be ordered separately.