The well known white exhaust coatings became common place during the 1990’s. They are applied on many of the new breed of turbo charged 4 wheel drive world rally cars. Proof that these coatings gave an advantage was their use by teams who were only interested in the highest performance in the most extreme conditions.
Many serious competitors have used these coatings on their 4 wheel drive turbo cars from Subaru to Mitsubishi.
Use of the coatings has become wide spread including:
Super car manufacturers
Formula 1 braking systems
National & cup racing
S2000 rally cars
Track day users
Fast road cars