This method has the potential to bring the well - established benefits of a fully variable valve system out of the lab and into production engines because cost and complexity aren't issues. (greencarcongress.com)
A key feature of the new exhaust is an electrically - operated valve system which can improve performance and enhance the exhaust note at the push of a wirelessly - linked button. (ausmotive.com)
A patented valve system ensures that the cup remains leak - proof but is always ready for drinking. (blog.guguguru.com)