MHO, you should be close to 150 with 4 15's but remember it's in a trunk, if you had a hatchback you would gain alot. I dont think that you will gain the 1.3dB (unless the mic is a totally different mic that is not calibrated properly or the same as the other) 150 in a stock car is hard to acheive but not impossible ( 4 15's is a good place to start though too
) It will depend on a few parameters that were not mentioned in your post. I have bested a 152.4 (and backed it up with 151.9 and a 152.1) with just two 12's and about 2400 watts, no wall, in an Escort though. The car was stock, but had several extra batteries too.
Since it was a dB Drag event what were your other scores? Curious as to how you scored in the earlier and later rounds.
