The invention relates to an extrusion line for producing plastic profiles, preferably plastic pipes, comprising at least one extruder (1), a mold (2), a calibration (3), and further subsequent devices. According to the invention, the mold (2) comprises an internal cooling, the flow distribution of which can be influenced, wherein at least one branch for a coolant is disposed in the interior of the mold. The invention further relates to a method for increasing the cooling power of an extrusion line for extruding a plastic profile, particularly a plastic pipe, comprising the steps: a) melting plastic in an extruder (1), b) forming a plastic strand and feeding the plastic strand into a mold (2), c) forming a plastic profile by means of the mold (2) and calibrating and curing by means of cooling the profile in a calibration (3). According to the invention, the temperature of the plastic strand is reduced in the mold (2) prior to exiting the mold (2), wherein the fluid flow is controlled in the interior of the mold (2) by means of a bypass (8), wherein fluid openings (9) for forming the bypass (8) can be opened or closed between 0% and 100%.