I went to Tremorz Auto Sound in Statesville, NC just to hangout with the owner and workers.
While I waws there, I meet some dude named Arthur McCracken who has a 8 15" Old School Sony Xplodes powered by a Hifonics Sampson (8000 x 1 @ 1 ohm).
He said he termlabs at 150+ and those Xplodes were banging pretty damn hard.
His car is basically a bandpass box because he hits higher numbers with the windows down then with windows up.