Price Increase Coming 2/1/21... ALL Billet Parts and/ or Products Made with Billet Parts

TracTuff RBB/ RBC Rear Wheel Drive K Swap Water Neck


The RWD upper water neck addresses a few concerns with the growing popularity of K swapping a number of front engine rear drive chassis. 

Normally, the water neck is pretty much right in front of the radiator and the two points are pretty much equal in height... and even then, the K is notorious for being a real bitch to bleed! Rotate the motor 90° and now you have to make the radiator hose either go up and over or down and under the intake manifold. Both will present problems, but one is uglier than the other, so down and under seems to be the most popular choice! To help, Pit Garage created a fixture based off of the S2000 intake manifold/ water outlet (position and angle) and I had custom tubes bent and weld them to my billet RWD housing... essentially mimicking the geometry of the factory S2000 combo.

This option has allowed K swapped S2000's to reuse the factory upper hose; in fact... I'm starting to see more and more Non-Honda swaps going to that hose to solve there unique swaps connection issues as well. The only short coming of this design, is that we are taking the cooling systems highest point and asking it do dive down under the intake manifold, creating a HUGE pocket for air to collect! For this reason, I highly recommend a swirl pot in this space. A fill pot gets runner up and a filler neck gets Honorable mention. If space or budget dictate you cant use those products, I recommends at the very least... a vent (pictured). 

NOTE: Made to Order - Ships Same Day IF Ordered before 11 am PST - If you are interested in a specific design that varies from this, please email us at If you have questions related to the configuration or options... PLEASE visit the WHATS WHAT or FAQ page. The tube is welded so that it sits level when bolted to an engine leaned back 15° (OEM position) for the traditional option and leaned forward 8° (intake side) for the gangster lean mount option. 

The billet neck has a 1/2" NPT heater port and the hardware kit includes a 5/8" hose fitting, a plug, four stainless M8 socket head bolts, and a Genuine Honda gasket. If you choose the bleed port... you will also get a plug. The tube is welded so that it mimics the S2000 outlet position when bolted to an engine leaned back 15° (OEM position).

DISCLAIMER: The Skunk2 Ultra Street and Ultra Race intake manifolds require a small change to the outlet position in order to avoid the plenum flange but the end of the tube is still VERY similar to the OEM S2000 water necks outlet position. The vent helps bleed the system initially but doesn't continuously rid the section of air and will accumulate here over time.