JLs Stealth boxes are expensive and worth every penny no matter what any dealer tells you. I say do it! Run it off a JL HD amp. Ive had a lot of experince with JL and other companies JL is always solid.
2011 550i xdrive : m5 front bumper and side skirts / xo luxury 20" Verona wheels / h&r springs / hertz and audison audio system
SOLD 2008 535xi
Performance: JB4 G5 ISO / BMS DCI / AR DP's / BMS WW Meth kit / ER CP / ER FMIC / HKS BOV / BMS OCC
Exterior: Avant Garde M310 wheels / Window tint / mtech halo upgrade / Sprayed tail lights & side markers / M5 front and sides / Front Lip Spoiler / Kidney Grills / Black BMW logos / LEDS
Interior: Custom gauges done by Simon