sounds like a heat shield loose,but has been removed,still a rattle,vibrating noise.only notice at 2500 rpm.below or higher and the noise fads away.ear by inlet manifold,you can hear the noise,also undernesth the car around the downpipe,sump.gearbox,the noise can be heard.i know that the starter is very noisy when starting the car.can anyone shed some light on this subject.thankyou.