Ours makes that sorta clicking noise but I only hear it when the engine idles, don't remember if I've ever heard it above 1500rpm.

Right now if you push ours past 3000rpm or so, the CEL comes on *has to get that EGR valve cleaned out heheh*

1995 Mercury Mystique 2.0 (125hp of FURY!) 2006 Chrysler 300C 5.7