This was one of those "if it ain't broke why fix it" points that my buddy the ASC mechanic keeps warning me about. But after reading that the original lma (slow assembly) on Honda b18 engines is prone to failure, I decided to give it a try. This made the engine quiet; much less valve train noise. Strange thing, they don't look exactly like the picture; Feathers are black, not silver. But I'm sure they will work fine. And my friend was so jealous that he plans to install the same settings on his Civic.