SPL tips?

Can anyone gve me some SPL tips that I can use? I have 2 audiobahn AW122T's only been used once for about 1-hour. I have 2 profile CA600's. I've heard some tips about fiberglassing the inside of the box, sealing it perfectly, guy told me it would add 10 db. I have the program WinISD, it's tellin me I can hit about 120? Is this accurate? I will be installing these into a Cherokee. I'm trying to run awesome power, What type of wiring should I get, 2 AWG? (split at a Distribution block to (2) 4 guage)

sealing the box will give you 10db!!!!
HAHAHHAHAHAHA
yeah, and adding audiobahn stickers to your back window will add another 5db

The main question is, are you planning on competing or do you just want it to be loud

I'm planning to compete, so what can I do to get maximum loudness?

well just to let you know, 120dB will get you laughed out of the parking lot, it won't even be enough to THINK about competing. Then again, those will get louder than 120dB.

Build a large ported box, tuned to ~50Hz. Really you need to find out the resonant frequency of your car and then tune just below it. Play around with WinISD to find out exacts, but I think an 8cf (4 per sub) box tuned ~50Hz would work well. Then play a test tone just over 50 for competitions. If this will be your daily driver you probably want a swappable port so you can tune lower (~30Hz) when you aren't competing (so the music actually sounds decent, or as decent as it can on those drivers).