My S3 started to make an awefull screaching noise today and I have no boost at all. Had to limp it home. I'm guessing turbo, sounds the same as when my turbo went on my old subaru. where's best to buy a replacement ? eBay lists them for £300 to £400 brand new (K04-022) but they don't mention a make or anything, are they any good ? i'm dubious! Can I buy a Hybrid turbo to replace mine ? if so where from ?