It is cooler in the car and supposedly better environment for the electronics. Although I have never heard of anyone having problems with the MSD box getting too hot under the hood. That is where mine is.
One drawback I have heard of when you mount it inside the car is elecrical interference "noise" reaking havoc with your car's computer. I have heard of people that have had to move the box or re route the wires when this happened.

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Black 94 GT 5 speed. 10# Procharger, E cam, 2 chamber Flows, 3.73 gears, MAC offroad H pipe, MSD 6AL, SpeedBrain
12.94 @ 104MPH
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