BOV, Again, bigger is better. Some guys run 2! The bigger the turbos you have the bigger the bov you need. You would need to get rid of more air quickly. Alot of people like the Tial 50 mm. Seems a little on the small side for me, When I let off at full boost it takes about 2 seconds for all the air to escape. Ball bearing turbos keep the turbine spinning longer creating even more air. I did not notice this with my slightly smaller non BB turbos.
