I have oil running down the pipe on the left front, ive been advised its a common issue

Has anyone replaced there's recently and use a ebay item
Ie
AUDI A4 B6 A6 C5 1.9TDI HOSE PIPE TURBO BOOST CHARGER AIR INTAKE RUBBER DUCT New | eBay

As i've heard horrors on poor fitting pipes or seals, but there between £40 - £60
Rathen then Audi £100+