Not suprised I've seen this happen before using these types of aftermarket CP.
Utilizing the factory Tb connection.
I've seen a n54 member put a silicone coupler and a T-bolt clamp over the part of the CP that connects to the TB. To stop the leakage
JB4 G5 ISO, E85 BB FLASH, WALBRO 455, DP'S, AMS FMIC, AE EXHAUST, VRSF CHARGEPIPE, SYNAPSE BOV, DCi