Box is a tad undersized (about 5 cubes), and the biggest slot port we could fit between the woofers - (and still be able to slide the box in/out of the trunk).Will be rebuilding it soon (probably 'in' the vehicle to get a bit more volume) and tune a bit lower.
It does a pretty consistent 149.5 at about 1700 watts, but on a cool evening, with a couple guys pressing both rear doors and his LC-1 dialed in a bit more on power, he's done the 150+ at 2 shows now... I believe the amp is clipping a bit at that 1800 though (can't recall his impedance rise at the moment) because the power starts getting really erratic if we turn it up anymore than that. On a clean 2k, I think he'll be knocking on 151. Hopefully a tiny gain from adjusting his tuning as well, might put him in the low to mid 151's. We're still not up to the efficiency Anton has shown on his two 12's setup though. This boat-of-a-car is a pain... Huge trunk - but small luggage opening.