I thought the TZ modified had more power then the TM modified? I have none modified TZ new in the box but just concerned it might be too much for the track I run. I guess I could dial the throttle down on the TX. I have it so I am going to give it a try this winter when I get my buggy and get it running. I have an old OS .15 CV-RX in mine right now and it is not all that fast but the truck handles so well I have won 2 out of 4 races.