So after get to knowing about buyee.jp from another member; I have decided to go online to purchase a descent air intake system so I can replace my factory air filter. Since one single air filter will cost me NZD550 and it doesn't come with the engine block. It took nearly 5hours to get it fitted since I'm a first timer.........yeah? After fitting I went for a test drive and I could hear turbo 3 x louder than before. And also it sounded like I have placed after market blow off valve. Is this normal?