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IC.2.5.1 The intake air may be cooled with an intercooler (a charge air cooler).
a. It must be located downstream of the throttle body
b. Only ambient air may be used to remove heat from the intercooler system
c. Air to air and water to air intercoolers are permitted
d. The coolant of a water to air intercooler system must meet T.5.4.1
IC.2.5.2 If pop-off valves, recirculation valves, or heat exchangers (intercoolers) are used, they must be positioned in the intake system as shown in IC.2.4.2.b
IC.2.5.3 Plenums must not be located anywhere upstream of the throttle body
For the purpose of definition, a plenum is any tank or volume that is a significant enlargement of the normal intake runner system. Teams may submit their designs via a Rules Question for review prior to competition if the legality of their proposed system is in doubt.
IC.2.5.4 The maximum allowable area of the inner diameter of the intake runner system between the restrictor and throttle body is 2825 mm2