I am new to this forum and I am hoping I am asking in the right place...
I have recently purchase a K&N Apollo Universal Closed Air Intake system and plan on putting it in this weekend, however I've heard that I will need to get some rubber to put on the opening of the throttle body as the diameter is different from the piping I have.

I just wanted to know if there was a website that had the different sizes of all the engine components? If not do people know the exact size? I don't have time to undo everything and measure it before the weekend...