This pipe works amazing IMO. On my .12 TZ 5P, everyone says it sounds like an F1 car on the track. Immediate throttle response and power. It also runs cooler than Alum. pipes. I have yet to break-in my 3P OS Speed Tuned with the same pipe to confirm the results with this engine.
So far, I have not developed any cracks other than a hair-line I got when I clipped the track sidings. In this incident, I broke other stuff on the car, so I think the pipe held up pretty well with just a crack on the stinger.
Besides..... a little CA glue and you are back in business.
Can't say that for the aluminum pipes.
Like everything in the RC world, once proper development has been put into a product, it all comes down to personal preference and local senario after that.
I was recommend this pipe by Team Kamikaze some months ago and have not been disappointed since.