Where to put MSD 6a?

I mounted mine on the Frame Rail under the Battery, mounted to a piece of metal and then used the threaded holes in the Frame Rail to bolt it up so I did not drill a single hole in the car!
 
Drivers side fender...:shrug:

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I'm still waiting to mount mine on my new car. My old mustang had a small bracket that held it to the front bumper (the white piece behind the fascia). I never knew it was there untill I totaled that car. Nice, clean and out of the way.