The track in episode 33 at the beginning of the chase is "オーバーヒート" (Overheat) from OST II (track 4). They cut the first 20 seconds. Many tracks can be heard not in their full lenght in the show; some parts are cut to fit timing better...
"Idle speed" should be chosen over "Idol speed" for the reasons given before. And as Illidan said, it fits the context and, to me, more the way they named tracks for the OST; their names are revolving about driving/car.
Again, "idol" could fit if it was a track made specially for episode 33. But it's not. The track is a generic action theme used throughout the serie.
Reference
http://victorentertainmentshop.com/p...em_cd=VICL-840 (逮捕しちゃうぞ オリジナルサウンドトラック Ⅱ. Can listen to sample track 4)