Yes, I cut holes in the sides to plug in power supply as well as reverse view monitor. Seal with coax weather seal. You can add and remove it like putty. For intercom, PCI sells the cable that connects GoPro to race radio.Sorry to slightly de rail, as far as running a go pro off 12v, I only get maybe 40 min of footage off a battery, are people drilling into the case to feed the power cord then silicone the hole? How about hooking up audio, how are people getting their intercom hooked up to the go pro?
Something is wrong then like dzrt mentioned. When I was filming for Steven Eugenio I mounted 6-7 Replay's on the TT every race and one was wired to the intercom. There's no way Steven and Steve would have put up with that if it made any noise.based on my experience wiring in the comms creates a buzz in your earpiece.
while this can happen without a camera, the buzz you refer to 97% of the time is from improper grounding (search "ground loop") and can be addressed.
I've had nothing but bad luck with my Repay and I've spent a lot of time with them on the phone. Every time it is" you need xyz card", "format it", etc. The card that came with it didn't even work. The xyz card didn't work.
That's a shame, I've had all good experiences with their product.