Obx probley does not, but Goingsuperfast.com has a set of headers with heat boxes for between 1000 or 1200$ (cant remember). Also, I have seen people make a small shroud that collects air coming off the engine oil cooler and funnels it into the chassis pick-ups for heat. This would be a viable option as it would leave you free to choose what ever headers you want. I heard the heat dosent get as hot, but it does work. I am personally going to create a pipe that is about an inche larger in diameter to slide over the after turbo section of my exhaust and blow air over that into a pipe to get the heat for my car. I plan on buying Eddie B.'s twin manifolds from him eventually that dont have heat.
P.S I used an OBX manifold on my Galant VR-4 and one day an seemingly normal exhaust leak transformd into my turbo and down-pipe laying on the ground at a stop-light breaking the turbo brakets and everything.
86' 930/GT-40R Sold
94' Rustang GT daily