when i ran my TRF415 last sunday in 19T.. i got nailed three times at the end of the straight by cars going full throttle.. in the following order.. one was a T-bone.. the other spun me around, and the last hit nailed the rear right end of my car.... what broke do you ask?

nothing. kept on racing. ive had similar incidents with retaining walls jumping out in front of my R3 at our local track here called socal.. but ill save that for the R3 thread. damn walls!

i highly doubt you need to worry about durability issues.