Ya welcome aboard 00grand-am.
I know you are new, But in the future please consolidate your posts into one. Just keeps things cleaner and It is outlined in the
Community Participation Guidelines not to.
but we'll let you slide this time
On the trunk and subs, shesh you could get 4-5 12's in there, and some amps
On the 250HP(

) even though he "says" its dyno'd I dont beleive its possible with the mods he had at the time, IMHO(in my humble opinion) you need to tune it way up for that and the stock injectors would not last long at that rate.
I read on another forum where some guy got a tune at a shop(no mods) and got 50HP for $300

On another post, a guy just built a turbo kit without any other mods, would not run any higher then 2500 rpm's.
He just put a turbo onto an exhaust manifold and thought it would work
NOT !
With boost you need a DHP or something simular,
bigger injectors and someone who is a really good tuner

Plus a few other odds and ends.
Ya grfnkl, some people

opcorn:
Nice Xmas poem too !