[san rensho]

I downshift like this. As soon as I put the clutch in I rev the motor and simultaneously move the gear lever for the downshift, so that the car is revving as I pass neutral. Shifting to the lower gear and then rev matching does nothing to relieve the wear on the synchro's, although it will lessen wear on the clutch, which can be very substantial when downshifting without rev matching.

Any time the car lurches when you release the clutch on a downshift, you are slipping the clutch and causing wear.