When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
no, you can remain in G-Stock.
Stock section - 13.10 Letter G: The installation of water expansion tanks is allowed. The installation of oil catch tanks is allowed provided the PCV system is not altered.
Be aware that the Alta filter will move you to STX. You can only use a drop in replacement filter (or no filter if you choose), and the stock airbox cannot be altered in any way.