Platinum TT™ Spark Plug (4503) by Denso®. Unlock the performance of your engine and improve the operation of your ignition system with this quality product. Precision engineered in compliance with rigorous industry standards, it will meet or even exceed all your expectations. Go with this top-of-the-line product and get the maximum in quality and performance. The Platinum TT™ concept originated from Denso’s latest original equipment spark plug technology, the Super Ignition Plug (SIP). Until recently, this OE iridium Twin-Tip design could only be found in the most technologically advanced automobiles. But now Denso is offering this cutting-edge technology in a brand new platinum/titanium design customized for today’s value-minded automotive enthusiasts.