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I added the HK system to my order without ever hearing it. Its worth every penny, although it sounds like a $$ from the outside of the car. Not sure if it's the way the subs are facing under the seats or just the general design. I had a loaner that just had the basic hifi system in it and it did the same thing. It just seams that the HK has more power and more adjustability so it's a little worse.
Inside the car it's worth every penny.
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/ 135i - M-Sport / 6-Speed / BMW Performance Exhaust / BMS Intake / JB4 Stage 2 ISO + Flex Fuel Wires / BMS 3.5in Down Pipe / CP-E Charge Pipe / Walbro 255 in-line fuel pump / BMS H8 AE / BMS SSK / APEX EC-7's with Nitto NT05's / COBB Tuning Sport Springs / Koni Yellows / Wagner Evo 1 / Blacklines / iCarbon Rear Diffuser / BMW Performance shift knob/boot / BMW Performance Steering Wheel /
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