Suggestions on box design

[Bass so loud it HZ]

I have a guy building me a box for 2 18 inch rs plats. Originally I was going to tune low with a ported box. But I have been running in comps the last couple weeks and I'm kinda hooked. How could I get the best of both worlds was thinking maybe a 4th order or 6th order box or maybe even a cpillar. Really wanted to add two more but it would just cost to much. Would I be louder in a 4th or 6th order and be able to play low and get windy but still be able to hit high spl score ?

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