I ordered my unit from CarID.com.
The unit I received had the actual gunmetal pipe slightly too long and I had to trim the pipe.
In either case, I would recommend that you proceed with the install as follows:
Start by installing the base/frame/box of the system onto the car, labelled 1 in the picture above.
The said base/frame/box contains a circular opening where you see the pipe and filter connect. This opening has a rubber seal that that fits along its inner circumference supplied with the kit. Install the seal now. Grease the seal along its edges after you install as it will be a very tight fit in the steps below and the grease will help.
Install the filter, labelled 2 in the picture above, into the box making sure that that the stopper edge of the filter is sitting completely flush and tight along the inner box circular opening (as per the image below).
Next, connect the pipe to the filter as per the first picture along area labeled 3, also making sure that the pipe's stopper is completely flush and tight against the outer side of the box, as per the picture below.
Finally connect the other end of the pipe to the throttle body as per area labelled 4 in the first picture.
The connected areas along the box should be sitting nice and tight along the box like so:
If, like me, you receive an incorrect pipe length, then depending on where you start the install, you will either end up with the pipe mis-aligned against the throttle body, or the pipe will go completely through the circular opening of the box (i.e. the pipe stopper will end up inside the box and not sitting flush on the outer edge of the box), thereby effectively turning you Cold Air Intake system into a Hot Air Intake system as all the hot air emanating from the engine bay will be sucked into the system from the resulting gap along the circular opening of the box.
The remedy, in such a case is either to return the unit because you were shipped the wrong one, or to trim the pipe down to the correct size, which is what I did.
Good luck with your install.
PS: Don't forget to plug in your sensor cable!
