In fact, I have only seen it on one, which had a plug because the car had a permanent transmission filter. (mechanics.stackexchange.com)
If you mean that it takes longer than normal to engage the reverse gear, it cold be due to a dirty transmission filter or low transmission fluid. (yourmechanic.com)
Porsche Boxster 2000, Professional ™ Automatic Transmission Filter by ACDelco ®. (carid.com)