Filters don't work well on an SRX. The area is quite small between the carbs and the oil tank, and we have the steering stem to compete with, so the middle filter must be angled. Stick with the airbox.
We are currently working on a bolt on air filter kit for the SRX. No testing has been done with it yet but it might be something to keep your eyes open for. I will keep everyone updated when it is released. Should look something like this...