I have had my single MT up to 151.7, I found that the MT likes a HUGE box for low tuning. My last box for 1 15' MT was 6.5 cubes tuned to 32 i belive and did a 147.3 at 30hz at the headrest.try something like this
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2 MT 15s, 2 20.1s, 2 6" aero ports, 153.7 with zero testing and box built the day before
Well as for DB drag my car loves a low note sealed at the dash, My single 15 box actually peaks at 27 at the dash and only like 1db down from the headrest. Ill be doing bassrace this year in the 49.9 classoh ur a meca boy //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif , never mind anything i said