The R&D Engine Thermostat and Intercooler Cooling Kit is one stop shopping to solve several big issues with the OEM cooling system. Engine temperatures on a RXP 260 engine with performance upgrades can reach 190-195 degrees with the stock cooling system. The R&D Kit changes out the stock thermostat for a new cooler 160 degree thermostat. The R&D Kit also separates and re-routes the “intercooler out” and “engine out” water lines to allow less restriction and more water to flow through both the engines exhaust system and the intercooler which promotes cooler exhaust temperatures as well as reducing intake air temperatures. The R&D Kit also includes two new 1/2 inch water bypass fittings for the intercooler in and out lines, one to be used with the kit included high pressure relief valve, and one for the new intercooler water out line. The R&D “high pressure” relief valve will protect the intercooler from being broken due to high water pressure spikes. Cooler engine temperatures, cooler intake air temperatures, and cooler exhaust temperatures all add up to a noticeable RPM and top speed gain.