I still got both BS, but when i got the car i did TB on it and didn't pull out the front BS, so right now only one is spinning and other one in place. I noticed a little difference in vibrations but not that much. I just didn't have time and money for a new oil pump to get the BS out and do it right. I'll just wait till I'll take motor apart and build it to get both of them out. I you doing TB and don't know how to remove BS or don't have time and money for Oil pump just replace TB and take BS belt out.