Not really very close at all. Goes down the firewall from the master and follows the inner fender before it shoots straight over into the bellhousing. Probably never gets any closer than 6" to headers and they're ceramic coated as well. Have heard of the issue though and seems like the logical problem. It's a braided stainless line, so I'm sure that's probably retaining some heat compared to a factory style plastic one as well. Guessing it's just trapping some hot air between the firewall and floorpan and cooking the line there. Easy enough to throw a heat sleeve on it, so have one on the way.