I have my used MSD 6A installed and mounted on the firewall right in front of the driver. With the windows up and not moving, you can hear the box making a buzzing sound... is this normal???

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1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech Thermomaster chip with 160stat, MSD 6A, March Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, !TB Coolant, Spohn Dual Cat SubFrame Connectors, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)

Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's, Accell Universal 24# injectors

More info and pics on my webpage:http://go.to/iroc-z

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My 6AL box does the same..... phoned JEGS about it they said it was completely normal.

 

It is completely normal....

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Now I HAVE_A_Z
89 IROC 350 TPI

 

The transformer in the units will make a buzzing or humming sound. We coat the components to make them water resistant, if this coating cracks on the laminations of the transformer you will get this buzzing noise. It is not detrimental to the unit in anyway, but if it is to bothersome we can replace the transformer in the unit and recoat it which will quite it down. All and all you should not here it.