Denso K16R-U Original: https://amzn.to/2W4dJI4 (Amazon Affiliate)
Denso PK16R11 Platinum: https://amzn.to/2GAUO0R (Amazon Affiliate)
Tekton 24330 3/8″ Drive Torque Wrench: https://amzn.to/2PQrI1O (Amazon Affiliate)
Denso Spark Plug Installation: https://densoautoparts.com/spark-plug-installation
Toyota Spark Plug Guide: https://www.toyota.com/toyota-owners-theme/pdf/09_SparkPlugs2015_final%5B1%5D.pdf