Typically slower overdrives benefit from smaller top inlet openings and with these shoes a racer can size the inlet to there injector opening making for a smoother transition into the blower allowing for more boost.
Made from billet alum. and anodized for corrosion protection these attach inside the blower inlet with three 10-24 bolts.
Shoes can be stacked on top of each other inside the blower inlet to make the inlet size of the racers choice.
Customer got out of racing and had some new unused PSI shoes left over they traded in so buyer gets a new part at a great price!!!!!!!!!
Note: This is a used item. This item might have been taken in on a trade. RBS may have inspected this item and deemed re-usable. There is no warranty expressed or implied with this item.