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Nice vids...how well does the stock system keep up with the new sub? Do you think the bass would pass through to the cabin as well in a coupe vs your vert?
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'09 135i - Step - Sport - M.Blue - JB3 - Eibach Drop -Alufelgen SF-71 for 1 Series
'08 535i - Step - Sport - JB3 - BMS Air Filter - HKS BOV/Pipe - Aquamist water/meth injection - EuroLights Yellow ION Foglight Bulbs -
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