If you are running it in in the same area as the OEM loom then I think normal loom will be fine. I haven't noticed any high-temp loom and I have disassembled almost the entire wiring harness. As long as it is not laying on a hot engine/tranny part then normal looming should work. Its been fine for me and I have the normal looming all over my enine bay due to aftermarket sensors, extended O2 wiring, upgraded electrical backbone, etc.