Moroso 85600 Air and Oil Separator for Mazda Miata MX-5 - High Performance Breather Catch Can Kit - Reduces Engine Sludge & Improves Performance - Ideal for Track, Racing & Daily Driving

Does it's job well. Keeps the oil from being pulled into the manifold while helping my 408W stroker to vent pressure from the crankcase! True, there are cheaper catch cans, but this is worth the money for peace of mind of a high quailty product. And, not modifications needed...