Ah forgot to add the part about what comes with it....Everything comes with it that you need to mount it...What does not come with it but is OPTIONAL is the drill bit (titanium $10 size 11/32, and the tap which is used to make threads in the hole you drilled which is NPT (National pipe thread) size 1/8 27 OR 28. The tap is $5. The reason I sell a $10 drill bit is because thats what it costs...damn expensive home depot...there is a "metal bit" cobalt bit made by crafstman which will also work which is $8. The cobalt is probably a better idea since it doesn't have a pilot point and won't kick you after you get 3 mm in.... anyway I just don't want someone trying to drill out their (steel?? or likely aluminum) intake with some crappy wood bit and not being able to get through.