Did you MAKE SURE you had the tube vent seals seated on all four locations WHEN you reinstalled everything (namely the crossover pipe????) ORION is right here, I BET that's the problem. DID you torque the crossover pipe tube correctly??? If not this would cause the vent seal (s) to not seat correctly. How long did it take for this leak to become noticeable AFTER you did the install????? Have you pulled the intake off to see if the the seal is even on the area/side that's leaking???? This wouldn't take that much time to do........