The cars a 2007 seat Ibiza pd130, big power, pushing close to 300bhp, does anyone know at what power the bmc cda become restrictive? I had an open cone AEM dry flow air filter, but fitted a bmc cda air filter (type 2) yesterday, haven't noticed much difference, it feels a little smoother with the bmc but I don't know if it's smoother, or just restricting me, creating less power thus making it feel smoother. Any input welcome 
