After "rusty hinges", Knocking on hell's door

[TurboIQ]

... figuratively speaking of course... hell being some component of the direction. When I turn in a parking lot (sharper than let's say on the highway where you barely steer), I hear and feel a knocking pulse againt the steering wheel. This only occurs if I give some gaz while turning... otherwise, nothing. I guess my CV's are due. I'm not very familiar with the exact name, and I'd like to know how much I should prepare myself to donate to a Subaru charity.