BajaRon
Well-known member
Do they both help with the heat by your calf on the left side
Wrapping or coating reduces the external temperature of the exhaust system (the part that is treated). I believe the reduction can be as much as 200 degrees. So anything in the vicinity of the treated exhaust will be cooler.
The air in the engine compartment will be cooler and incoming air will be more effective in getting rid of heat buildup.
It is not Nirvana, by any means, but if done correctly, it does make a good deal of difference.