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This intake system fits on the engine in a 2008 Infiniti M35X and others that have the same 3.5 Liter engine such as the G35. The only thing I didn't like is that it is short. If you notice in my pictures, I had to buy an extra 45 degree intake tube so that the filter could reach the hole space that previously housed the stock intake box. Also, the blue hose included must be used in conjuction with the stock black hose already in your stock intake system. Check picture for a visual. The metal bracket that holds the intake tube in place must be artfully attached as I did. Not so much a big hassle. It's good to have an extra hose clamp as you see in the picture showing the bracket. The stock MAF sensor already in your intake system attached perfectly to the tube included in this package.The diameter of this intake tube is 3.0 inches! It is not 3.5 inches! The description of "3.5" is not accurate. I wasted time buying a 3.5 inch 45 degree tube only to return it and buy the correct size.