I have the whole R2C set up. I came from the Stillen system. Reason I went with the R2C is because my engine light kept coming on. But when I had it for some reason it felt a little more responsive low end. I think it was the size of the filter itself. The R2C is huge compared to the K&N on the Stillen. I want to try getting a smaller cone filter and testing it. Does anyone know the size of the opening on the R2C filter?

if it ain't broke, don't fix it.

I have the R2C and want to know can you replace the filter or do you just keep cleaning it? I have cleaned a few times now and it is starting to look like it needs replacing.