I mounted my MSD6AL under the drivers seat. I routed the wires directly under the carpet, along the door trim, then into the engine bay through the steering column boot. The finished look is really nice.
Make sure to solder the connections for best results.
Good luck, E
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1991 5.0 LX Coupe -37,800 miles
13.17 @ 106.14 mph w/ 2.138 60'
Pro-Charger D-1SC on the way!!!