Hey guys I am new to the Volvo Forums. Just picked up a pristine 1999 S80 2.9 non turbo. I love it. Great car. I am looking for some guidance. I just installed a JL Audio J2 500.1 running a Rockford Fosgate HE2 DVC 10" in a SubZero Bandpass enclosure. Hits really hard and sounds awesome. Problem is my headlights dim whenever the bass or drum notes hit. I am thinking of doing the Big 3 Upgrade, and /or installing a higher output alternator. Has anyone done this before? Which is better? I am confused because the battery is in the trunk and not sure how the Big 3 can be done on this car. BTW I kept everything else stock. Stock HU-611 amplified set up. I tapped into the rear speakers and used an in line converter for the RCA hook ups to the amp. Any help would be appreciated.