Well right now I've have been trying to find a really low priced cool air intake and exhaust for my 2008 xD. If anyone has any suggestions Would really appreciate it.
Auto Zone has a choice of Spectre air filters (not specifically cold air intake, as it comes with no tubing) but they appear to do the trick pretty well. ~$20-25 for the cone.
Just attach the end of the filter onto the tube. It's a one-size-fits 3 increments kit 2 inches, 2.5 inches, and 3 inches, methinks? just take off the air box and replace with cone.