True but I have seen several to quickly broken 12TZ engines. If the lifespan of the XZ is comparable with others then it is a good deal.

I just wanted to notice that there is more making the total costs than only the price of buying it. Cheap engines is what we all want but if they are unreliable it will cost you points at the races and on long term more money. Not saying the XZ is unreliable but knowing the TZ I would just wait and see.