I decided to hold off on the TZ for now.
I just ordered a TRX 2.5R for the sprint car
I didn't want to wait till the TZ was released later this month & sit out of the racing till then..
I'll keep checking this post & when the TZ's been out a while & I see how they preform & how long they hold up & then I'll see about getting one.
Then at least doing it this way I'll have a spare engine for my Revo when I get the TZ.