Best Dash Cam front and rear for Street Racing capture

For spirited driving I would recommend a wedge-style camera that is mounted directly onto the glass, rather than anything using a suction cup or ball joint, to minimise the effect of vibrations etc.

Dashcams are typically setup to record evidence rather than cinematic footage, so you will find the video usually has higher contrast and sharpness than you would get from a GoPro or your phone, for example.

Dashcams generally have a narrower angle of view (approx 130 degrees horizontal) compared to the wide angle view on a GoPro.

You might consider something like a Viofo A129 Pro. It records decent quality 4K on the front camera, and lower resolution 1080p on the rear camera.

If you want the same quality front & back, it may be worth getting a pair of single channel cameras.

If you want something more cinematic, the GitUp F1 or Mobius Maxi 4K are small matchbox-style 4K cameras that record high-bitrate video comparable to a GoPro, but will run off a continuous USB power supply. You will need to sort out your own mount though (I had a simple wedge 3d-printed for my car). There may be other box cameras to consider, the ones used on racing drones etc.