B & M shifter question

I can get no more than 1/2" clearance from the header tubes in two different spots - ordered the Thermotec sleeve - here's hoping.

Don't think its going to work. Didn't on mine! Problem is that the cables they use are nothing more than a plastic shield with the wire running inside. ANY heat will soften the plastic then when you go from any gear toward park, you are pushing the cable inside the shield. Since the heat has weakened the plastic shield it begins to bulge at the hottest spot and soon the cable pushes thru and viola, NO SHIFT. Been there, done that. Went to the rear entry shifter and routed the cable towards the rear and up thru the floor. Problem solved.

Larry