i dont know if they make one for the mk5's but i have the forge spliter valve on my mk4half the air goes back into the air intake so the ecu dosent mess up and run rich and the rest vents into the atmosphere so i still get the bov sound

 

what is this for? Also what is the n57j valve?? Just curious cause I'm gonna start adding forced induction to the VR6 and need to know everything I can. Not like putting together a 5.0 mustang and supercharging that, American Muscle Cars are incredibly easier than these VW's.