So I ripped out the subs before I sold the truck. I made a sealed box with 2 10s (fosgate P1 and kicker cvr-10) and they rattled that truck pretty damn good. No show winner but enough to make you have to tell over the bass. I put the box in the 87 camaro. Wired up the amp. And you can see them defenitley moving like they should. But the transfer of sound is not there. Hardly hear them at all. Is it because of deck? I have it set up the best I can. Like I said. They move. Even with the hatch open they don't make the good noise. Pull the box out of the Camaro and it's louder than when it's in it.

 

I should note the box isn't anything fancy. I caluclated the airspace for each sub and build one box with a divider inside of it so that each sub has its proper air space. Pre drilled holes. Used liquid cement caulk. Sealed it up screwed it down and used RTV silicon to seal in the subs.

 

Check the polarity to each subwoofer. It sounds like one of is not phased correctly.
All that means is to get that big bump, both cones must move out at the same time.
Speakers move air. If one cone was going out while the other was moving in, then the net air movement is zero - no bass.

 

that was it. Many thanks. I'm an idiot when it comes to sound stuff.