Oh, Chad, thanks for noticing! I forgot to update that, aha.
They are back in stock.
This exhaust is not great for 70cc, cos its simply not made for 70cc. Its made for a mid range 50cc small setup; meaning, any 50cc (stock or fast version) and possibly a bigger carb which will bring up the speed and rpm.
It won't ever run great on a high performance setup; which makes more RPM than stock. This exhaust won't be able to handle the power, and the boosts which many high performance setups bring...
Especially a proper variator setup will not/never really work great with this exhaust... Ofcourse you can drive, and you will still have a reasanobly good acceleration and speed, you will never get all the potential power out of your high performance setup with this exhaust.
I suggest; Polini Top One, Polini SP, Proma Circuit (sold out, will NEVER be back in NEW condition, too bad, greatttt exhaust with - variomatic too). There are a few more good exhausts for high setups... but the LeoVince is not really one of them.
It might work great for Chiefthundernuts if he per haps did not modify his engine fully and if he is not running on full power...