POLINI Vespa Racing Exhaust PX125, PX150POLINI Vespa Racing Exhaust PX125, PX150 Polini Vespa Racing Exhaust PX125 and PX150 offer great performance for a competitive price. While torque in the lower range may not be as noteworthy as some English racing systems, the Polini offers plenty of steam in the mid range and produces higher speeds with shorter gear ratios. This makes Polini ideal for large frame Vespas and cylinders of 166 CC or greater. Its tinny sound at lower RPMs improves as the