what car are we talking about here?

yup all targa yan and v12 subs... a visit to Raon should do the trick. But its a bit of a stretch if you include the labor costs. You may want to stretch your budget to 25K if you want to include an HU

or.....

you can look for 2nd hand amplifiers, seperates, and subs... dami diyan sa kotseaudioclub.com under "advertise" section. Remember don't rush, take your time when buying your components