Thanks for the reply!
I finished the game and now I have thought of the following:
Bolus was told to ride away as far as to lose sight of the Kickstand. Then he would make a turn and return to it ASAP. When the Polecats leave, we see that the limo is still there, so the limo followed the band.
Corley obviously rode with one of the bikers (we hear him screaming), and I guess Rip/Nestor told him that Bolus is in the john and they will be waiting for him.
Now, Bolus returned not long afterwards, the trio did what they had to do and their limo followed the band. Since Corley required frequent pit stops they would easily catch up with them.