That dos pipe is a clone of the Ninja g2 replica and it is a great pipe. I had it on a kit with 125/175 durations and it hit hard around 7k
I liked it better than the Doppler.
If you buy it do something about the baffle before you run it though.
Mine broke off within a few minutes.
Hard to tell from picture but it looks like the entire baffle is not connected anywhere to the pipe. The baffle tube just slides over the round plate on the stinger and is supposed to stay connected somehow.
You could rivet the outer baffle tube to the round plate but the tube is really soft aluminum and the rivet holes may not hold up.
Or take out the rear rivets and take the whole thing apart and weld the perforated tube to the stinger.
It's a shame because it's a great pipe otherwise.
That kit you have seems like the perfect French 70 kit. You could probably run 50cc kit durations and compression ratios and a long stroke crank and have some fun without too many problems.