Same sub, same amp, same car...a ported box built to the proper dimesions will be louder than a sealed box built to proper dimensions. It's really hard to tell given 2 different size subs though...I would think "loudness" would be similar given the two, it's really a throw-up though until you've actually listened to both side by side. What you do gain in spl with a ported box though you usually lose in sq.