Ted,
I'm glad you brought this up. As long as you are not running twins or LP, it is not needed. The OEM catch can is sufficient.
You can try to rig it so you can pop out the OEM one and put this one in it's place.
I want to remind everyone that every week I go over the rules and regulations and they change. We are currently working with the NHRA to develop the rules. Please bare with us as we learn and grow.
What I will probably do is have a set of rules we put out towards the end of March that will be what we use for this year. That way any changes won't occur until 2004.