just drill the air box and stick a panel filter in there. I'm tired of telling people this! Unless you live in a seriously cold country or you have an excellent heat shield (I'm talking expensive stuff or custom jobbys) then you will loose more than gain, and in a 1.8 you can't afford to loose much tbh....Just buy a K&N or pipercross (pipercross in my opinion) panel filter, remove any restrictive bits of plastic in the air box and the trumpets on the inside of it then drill some holes or a section out of the lower air box half from the front, wing side and rear of it, not the engine side of it! Now that set up will make a positive difference and it will also work out cheaper than buying a cone filter.