personally it's not sensative enough for my taste. Low end sensativity is very good I'm sure, but low bass is so easy to get in car that I'd rather get some easier free output up top at 80 than more gain at 20. SPL in a sealed enclosure is all about effeciency up top and xmax and you ability to use it wthin a given box constraint down low. You need xmax to get loud sealed, but if you need to too big a box to get the thing to move then it's worthless.
Have you modeled the LMS 4000? The Q is really high unless you go with a very large sealed box. Anyway the AV is around 90db/1w/1m and will operate in the smaller enclosures you normally see in a car alot better. Before displacement becomes a factor xmax going from 22mm to 30mm is a gain of maybe 1.5db's. This will only matter at frequencies where you drive level would exceed 22mm in order to reach that target SPL given a 15" cone. However, the 5db's of effeciency you gain up top with the AV is substancial from 50hz on up that's going to matter more than xmax. IMO, it's a better match for a car, especially since you can get a q of .5-.7 in relatively small boxes.