Ford Focus 2006 1.6TDCI

Hello. I've just bought a Ford Focus 2006 1.6 TDCI and had a few questions. The first is whether or not this pipe should be coming out of this part of the engine or not, as it looks like the metal around the are has been peeled back? The car is also making a whirring/whooshing sound when driving and with the tyres being bold on the outer edges of each tyre I wondered whether or not I should get all the wheels balanced? The second question is that when I brake there is a rubbing/grinding sound and is this normal? When I decompress the brake peddle  there is also a click/ping sound? Apparently new brake pads (possibly discs) were fitted during the MOT (paid for by the dealer and the MOT completed by another garage). I've also noticed quite a lot of rust on the rear axle and two brake drums and was this normal for a car of this age or is this excessive? Apologies for so many questions at once. Any advice/knowledge would be greatly appreciated. Thank you in advance.