2008 GL 550

I just bought a 2008 GL 550 , im looking to keep the head unit to the stereo and replace the speakers and add a sub woofer. I love loud crisp music but also want to feel the bass. i was trying to find a semi custom enclosure for the bass like JL audio but JL does not make them for the GL's

Im not a stero guy but know i like it loud....Please help

Cymro99

any update on what you did with your car? i"m in the same boat 3 years later ;-)