Vented front disks, solid rear. My rear o/s caliper siezed on and destroyed the disk, seems that its a common problem and the sliders rust/size up.
Its worth checking all the metal pipes that run across the engine and back on the near side as they are known to rust.
I've put the boost up a bit, remap, BMC panel filter, Powerflow s/s from cat back, decatted, mafam fitted. And now 134 bhp, but by fitting SDi injectors you can get 145.9 bhp, so I now have a set of them to try out.
My turbo pipe popped off, as it does pick up a bit of oil, but yours sounds worse than that.
They do go well, and dosnt have to cost the earth.