lol guy that is a nice setup i am sure that it is loud in person but i wanna shed some light on something for ya.
jonathan cortez, he's on smd.com he has a black dodge ram with 4 dc lvl 4 15's on 4 rf 1500.1's. in a bandpass box tuned to 34-36 hz i think, i saw this truck for first time at a show in memphis tn an t his guy played juice box for a streetbeat run an done a 150 an held it.
**** song peaked at 36hz an held it for 30secs on a 150 an some change. i am not saying that what you have isn't loud an won't do a 150 but its gonna take more than just a drop in box build an do a 50 without knowing what to build it for.
that box design you have is capable of doing a 150 but its gonna take a lil more power an prolly another box tuned maybe a lil higher than 33hz.
just my 3.5cents.