Do yourself a favor and get an external microphone, and a suction cup mount
Amazon.com : GoPro Suction Cup Mount : Camera & Photo
If you have a Hero3, you'll need an adapter, and if you have a Hero2, you'll be able to directly connect it. Of course, you'll need a 6-12' extention cord, and need to tape it to the panel gaps. I mount the microphone with tape just above the licence plate, in the recess.
Amazon.com : GoPro 3.5mm Mic Adapter : Headphone Adapters : Camera & Photo
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B00...?ie=UTF8&psc=1
A couple samples of mine:
https://www.youtube.com/watch?v=zxCh...IpVPI8SI1X18Wg
with in-car at the end, attached to the right side of my helmet. (the mic is located about 6" above the exhuast exit here, so you can hear why it needs to be farther away).
https://www.youtube.com/watch?v=evA3...IpVPI8SI1X18Wg
I like the roof mount better for watching my lines afterwards, since it's similar to a view that's in Gran Turismo
