Before I even got my skunk2 springs, I managed to hit the tip of the exhaust and the actual canister while coming out of a shitty ass tacobell. Mostly because of having 4 large people in the car though (damn you 850lb weight limit!). I drive more carefully now with the skunk springs so I have yet to ever hit it again. I must say though, the HKS is pretty beastly when it comes to taking a hit, its barely scratched at all, and it was a loud ass hit.
As a side note, I absolutely love this exhaust, its not very loud at all, but as soon as you get warmed up its got a pleasant sound to it.