So, apparently my girlfriend does not appreciate it when we're at the track, and I stick three fingers out and try to shout "Third!" at her. It turns out that's not the clearest way to convey that she needs to downshift the car into third for the upcoming turn. She likes it much better when she gets an instructor with a helmet intercom system, and thinks that maybe we should pick one up for future events.
So, does anyone have any suggestions on where to get an affordable intercom system, and which ones are worth while?
