Intercooled tips are made from 2 pieces of tube. The inside is flares to meet the outside. There is a small gap between the tubes that acts as a buffer for heat. Think of it as a dual pane window. The inside tube gets all the exhaust heat and the outside stays about half the temperature. It works great on exhausts that are close to a plastic bumper so it doesn't melt anything. AFM stands for Active Fuel Management and are valves that are used for Eco mode in some Corvette models.