Turbo heads offer slightly better performance but require better understanding of how nitro engines work.

This info on the RB Concepts site is great!!! http://www.rbproducts.com/mainEn.php?part=Support

I have the Crazynut TM/TZ head and I love it. I'm now using it on my TM and what a huge difference! It's easier to run and maintains temps better while making more HP.