It has merit, sitting at the intersection of 23 and Polaris, 2007 Night Train, waiting to turn onto Polaris, it felt as though someone was holding a torch on my thighs, and this was after it was tuned, it ran hotter before I tuned it. I am not sure about catching denim on fire, but IDK, that Night Train got really hot sometimes, it would leave marks on me at times. I installed a Thunder-Max AT, exhaust, and CAI almost from new, I was aware of the heat issue then, and this lowered the operating temperatures a bit, but still hot, in stock form they run even hotter.