I raced a guy with the TZ 5 port and all honestly I wasn't surprised. He ran the MTX3 prospec and I had the MTX4 bone stock with the Carlsen TZ. We were fair around the track, but on the straights it was a matter of who got on throttle faster. Put it this way we were about dead even and his motor was
tuned properly. RCRevos' JLR EVO 2 screamed past us as well as a Ninja .12.
I'm not biased towards the motor because I just bought it, but from what I have witnessed it has proven itself and feeling a bit good I didn't spend over $300 on a motor alone.