Well I asked the dude who designed and built my enclosure, what it was tuned to, and this was his response:

"Your enclosure is tuned to 45 hz in theory and 35 hz in reponse to your vehicle."

I don't fully understand this. Does he mean it was tuned to 45 hz, and the tuning "changes" to 35 hz with the enclosure in my vehicle? I don't get it .