Simple, small, aesthetically pleasing, affordable, & in stock. Our very own RB head drain kits are in stock and ready to ship. $135 shipped in the USA. Each kit comes with our billet drain back body, hardware & Oring for a leak free fit. Minor alteration to the head to allow our kit to bolt on and you’re ready to go. Our very compact system is the smallest on the market for a very low key presence. Call or email us to order .