Yeah...I couldnt find the specs on the 9102, but found the 9103...whats the difference? Possibley on the year they were made... what at the power ratings of YOUR amp?

4 awg is probably enough for this amp...hopefully you do not have a 4-channel in there also running off the same 4 awg...that might be a bit much; depending on how you have it all wired up.

All things being equal, (same equipment and install) I would wager the 280 would be louder than your truck anyway....its just acoustics. Also, a vast majoority of the time, a properly built ported box will be louder (at a given frequency) than a properly built sealed box (again, everything else being equal).