The TracTuff VTC Limiter is yet another innovative product that was designed with the average consumer in mind! it offers a cost effective solution for limiting how much cam advance your motor see's, once clearances have been confirmed, and what we ended up with... is undoubtedly the easiest way to limit cam advance.  We assume that most K series engine owners own a 50° intake cam gear... so it made sense to limit the 50° gear rather than ask customers to go through the trouble of finding a 25° TSX gear and have it modified. The process is tedious, as you must find/buy a 25° RBB gear, pay to have it shipped, find a capable machine shop to handle the modification, ship it to them, pay them their fee, and ultimately pay for the return freight. Sounds expensive! and not to mention a total headache and a major inconvenience. Our VTC Limiter is manufactured from precision ground 52100 Bearing Steel and finished to exacting tolerances (+/- .0001") and then heat treated to a hardness of 60-62 Rockwell C. The limiter works by placing the pin in a specific cavity of the VTC gear, where it can float freely, ultimately limiting the amount of advance the motor sees... regardless of what the map/ tune calls for. Please note that it is not needed but if you have any concern with the pin floating freely you may have the pin tacked in place once you have confirmed your engines specific clearances.