Chief, Chad,
The LeoVince exhaust for a higher performance setup is totally not what you want, and I speak of experience when it comes to a 70cc+LeoVince... What I mean is, there is beter....... a lotttt better...
And something else, the LeoVince exhaust on that posted site is nearly 170 dollars?????? WTF....
I sell these too; 90 dollars.
Anyways,
Have you modified and tuned you engine and crankshaft? What pulley are you running? Have you adjusted your clutch (as in springs)? Which transmission are you running? I am guessing you got the high pressure head with the kit...?!
Tuning engine:
- inlet (make it bigger, cause it makes little sense running a 13mm carb on a 7 or 10mm inlet; I don't know what the stock inlet size is in the US, but here it's either 7 or 10mm depending on which TYPE of vespa Ciao you have...).
Crankshaft tuning can be done to also help the flow more.
And more engine tuning could be; tuning the mouth, the part at the front where the cylinder falls into... this is done to adjust the flow of petrol into the boost-ports (as we call them here) to the ignition/compression part of the cylinder...
Let me know if you have/have not done this.... I also have pics and so on on how to tune the engine fully, how many millimeters you are allowed to take off of the crankshaft+engine-inlet and into which direction! Al very important!