my brother runs a pair of them in his f150, ported somewhere around 5.8 cuft, tuned to 4? hz. His scores are just under 150 db, but he's running an audiobahn amp, can't remember the model maybe hcq 2300, anyhow, its wired to 1.67 ohms, which by my calculations would be giving it 1800 Wrms, that is once he gets a bigger alternator.