Driving around in traffic, the GTI's stock intercooler would easily heat-soak. When traffic cleared, the car would have some initial lag, but it would soon pass. A few weeks after the Neuspeed intercooler was installed, Los Angles experienced a heatwave, with temperatures in excess of 100 degrees F. The benefits of the upgraded intercooler were apparent even with the A/C running at full blast. There was no drop-off in performance. The new unit eliminated this heat-soaking tendency. An intercooler upgrade for the 2.0T is by no means a necessity, but there are benefits, one of which being that it looks really cool through the grille.
Neuspeed Intercooler Stock Intercooler
Reducing air charge temperatures is the main reason for upgrading the intercooler. Using data gathered from the intake manifold temp sensor, this graph demonstrates the difference in air intake temperatures on the third consecutive dyno run.
Monitoring the factory boost sensor is a good way to determine the effects of an intercooler upgrade's increased capacity. This graph shows how greater intake volume can affect boost levels and delivery.