I bought this from a shop in the netherlands like a year ago and never used it. it is designed for 65cc's but im sure most 70cc kits would work just fine with it. this is not your average home made pipe boost bottle. it has very thick high temp hose, large nozzle and is tuned for kitted engines.
not to complicated of an install. just drill a hole in the center of you intake, and jbweld it in or if you want to get super sofistacted you can thread the intake hole so you can screw it in and out.
i paid 30 euros for this so its yours for 25$. i can ship for under 5$ probably. if you want it, post here and paypal me at email@example.com