I'm rebuilding my Vespa 50s (small frame) and the mechanic have installed a 75cc cylinder kit. I wonder what is the best quality/price exhaust to give some extra boost?
In the article below mentions (T-shaped exhaust and adapt the contour to a trapezoid shape). What does it means and is the exhaust?
Not sure what they are trying to say, but Polini do a good pipe to suit up to 110cc and Sito Banana is nice one as well. remember you don't need any of the race pipes designed for 130cc and up.
You will probably need to up jet the main jet on your 16/16 carb, probably increase by 10% at 1st attempt or get the mechanic to sort it correctly.