It's a drive shaft (only the high-end JDM market CRX Si had a half shaft on the left so both drive shafts were the same length; something to do with torque steer)

Anyway, look at the rubber boot seals on both ends of the drive shaft making noise. Maybe, one has failed.
What's the milage on the car?
It could also be the brake dust shield rubbing against the rotor.

take care,
ChrisS