Anyone who's tuned an engine for more power knows what more heat can do to surrounding parts. And the more modifications you make to the stock engine with each tuning stage, the higher those temperatures will be. First to bear the brunt are essential engine components like the ECU and wiring, the fuel and brake lines, and airboxes and filters. When these get hot you'll immediately notice lower engine performance.
Parts that are damaged or fail because of radiant heat pose a huge safety issue. That's why proper vehicle heat management with the right heat-shielding products not only ensures optimal engine performance but also prevents potential hazards. The same products, encompassing heat shield sheet, tape and wrap are also used by car builders in restorations, as well as anyone looking to lower cabin temperatures.