i just got my stock 1990 BMW 318i and i bought a kenwood headunit, the problem is that the radio keeps randomly turning off, mot of the time its when i turn it up loud. Iv brought back to the shop and they tested it showed that it worked. the guy said it was because the old bmw's use some sort of a loop system and i needed to ground each speaker? has any one ran into this problem, also is there an easy to to install an after market gear knob? thanks a ton for any help.