Factory Core replacement Billet Grill. One of the finest Maxima Grills available since 1982. Simon's Thick Bar Billet Grills are made from 6061 Aircraft Grade Aluminium.They are one of a kind design and are easy to install. Coming Soon Installation Videos on How to install your maxima billet grill. These are step by step instructional videos you can watch over the internet and soon on your cell phone or PDA. Check them out at Yocar.com in the near feature.