Well I went and got a dB meter. I was at walmart, yes I know not the best place, and was looking at the radio and found a dB meter. Tested it on the Stereo in the Tempo 129.5dB not to bad for 3 speakers with one half installed and 2 12" subs. I'm only pushing 500 watts to the 12's and what ever the Pioneer head unit is I think 40x4.
Next checking the exhaust.
(http://i.walmart.com/i/p/00/03/39/91/01/0003399101201_500X500.jpg)
Nice dude how much was it?
$24.99. Ya cheap but it give me a good estimate on what I have to start with and will help me with the tuneing of the system.
And with some tuning I did hit 131.6 dB.
Sweet man, I checked my local Wal-Marts a few days ago and none of them sell that thing... shucks.
As long as its scosche its pretty quality they make a lot of aftermarket stereo stuff great company.