I'm pushing 137.9 DB with 2 12" subs facing the tailgate, from the inside, you can't hear any rattles, but outside, the boot lid and other various bits rattle so much its embarressing! The Golf for SQ is a great base, tbh, I'm bored of my bass and rarely drive around with it up at a deafening rate! I'd sooner sell it all which I will when I have my new engine and simply have a 10" sub and a set of comps! Just sound proof your boot floor and the lid, but you'll always get the lock mechanism rattles...