im sure i could do better than 145 on 3000wrms with 2 15s even if they are sq subs

Biggest obstacle you will run into is not having enough port area as stated above. all you can do is try it and test it and you`ll know for sure.

I have 2 10" wgti's running on 400 Watts RMS in a Ext cab truck and i am hitting about 137Db with music I think that you shouldn't have a problem... A buddy of mine had them on a Crown 2200.1 in a 30hz box and was hitting 140's... they sounded awesome and moved a lot of air.... I say you should not have a problem with that much cone area.

I hit 145db with a pair of W10gti's on 2200w rms in a 35hz tuned box
in a 4 door Tempo....I would hope you could hit 150 with a pair of 15's
your biggest problem is port design...utilize as much port area as possible

just so there's no confusion...a good spl trunk can make around 149db with 2000watts. ive tested a trunk that had a pair of 15's in it that only made 137db, it was loud to listen to but there isnt enough room to vent them properly. A pair of 10" in the same trunk have way more potential to be loud.

it got pretty loud with 1500wrms and a shitty box...so im sure with double the power and a good box i should do some good numbers...

whats funny is that no one gave u any advice, but everyone said how loud they were.

my question is Cavaliers or sunfire. only differences is the dash

i pulled a 143.1 outa my buick with 2 fusion nv 15s and 2 fusion pp20001ds at 39hz, it was great for music sounded loud. 7 cubes, and a tiny port it was like 43.5 cuin, they loved it. if i did a driver side port it woulda been louder and if yuli built it it would break a 50... i thik the key here is call yuli lol

well i can build a box good thing id need more help with is a good box design..i would like something that sounds good on music but can hit decent numbers too...so any advise would be nice...biggest box around 6.5 -7cft..thx in andvance