The SRT-6 seems to be running great and I'm loving it whenever I get the rare chance to make use of its power but I was wondering about a noise I hear when I get to a stop light with city driving.

Whenever I come to a stop and the gear is still in drive I hear a "whirring" or "mechanical pump" sound for about 3-5 seconds. I do notice that it causes the cluster lights to dim slightly while this happens so I assume that it must be straining the alternator.

Any ideas on what it is? I only have 1300 miles on the car so far.