I haven’t seen the class rules yet so it may be spelled out there, but does the engine have to be run under rules/restrictions required in TaG classes? For example, can the header be modified or a different header be used to make it work well on a laydown chassis. Do you have to run the x-30 pipe? Things like that. I was one of the small number of people that put together a kart for the TaG-E movement (small as it was) back in 2007-2008 and some mods were allowed to the header etc. Back then we could run any approved TaG engine so you were seeing karts with Leopard, Sonic (what I had), Rotax, etc.