The 1.8 unit does not like 100% BOVs. You need a recirc valve to keep your engine happy and stop your car throwing up faults. The Forge Split R is the what your after if your after a bit of noise. Search for dump valves, its been covered alot.

Ken
 
Dont know if it will fit mate but i have a non-recirc valve on my LC and its running fine. it seems to be hit and miss with the dump valves.