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any set up can be loud. i have seen radioshack crap sound super loud. its all about the install.

like said above gonig ported will make the biggest difference. you have the room so you best bet is to build it and see what you think.

how are the subs wired? that amp is only putting out 160 watts RMS per channel which according to that subs specs is way under powered. i am not up to date on clarion products so i'm not sure how over or under rated they are.

i would start with a 2.5-3 cube box tuned to 35Hrz. subs and ports pointed up.

you need to visit bcae1.com and learn to set your gains properly. they are not volume knobs. all the way up does not mean more power. you want to try and not use bass boost if at all possible. it will only introduce clipping which is BAD. if you must use it put it where you want and THEN set your gains.
a sub getting clean power will be louder and sound better then one getting "dirty" power

the grand am would tend to be the louder vehicle, but setting the system properly helps a lot :)
amp gains set right, head unit and crossovers, etc..

if you want it louder, consider going to a ported enclosure instead of sealed.
it'll be a bit bigger, by about 50%, but much louder.

the subs are facing the back door.

I currently have 2 clarion PXW 10 inch dual 4ohm voice coil subs with a clarion 640.2 amplifier both are last years model i think. the head unit is clarion DXZ665MP. the subs are installed in a sealed box and all this is installed in a 2003 chevy tracker. The shop in my area installed all of this but i found it not to be very loud at all even at the volume at 21. i originaly had all this in a 97 grand am except for the deck and it was super loud could even take it half the time lol. so i went into the deck settings and they had the bass set at -4 so i set it to -3 and it was much better but i dont want to bow the subs. i listen to them but they seemed fine no distortion . my main question is should this setup be fairly loud in a 2003 chevy tracker cause the back area is more open than a 97 grand am. dont know what the amp is set at cause its under the seat i think the bass boost is turned up just a bit not even at half. cant see the gain though. Any help would be appreiciated.