Yeah, I can believe that. That's just my personal experience after GPS'ing my old Maxi with a LeoVince pipe and my Pinto before the Korado swap. So, you will probably crack 40 with pipe/carb if that motor is still strong enough to pull that kinda speed stock.
For a 50cc, I'd say Tecno Boss. Simo is way too much for most 50cc cylinders, Estoril might be overkill as well. I think Jae may have a Tecno Boss, not sure if he would want to sell it, though.