there is a lot of information on this sort of stuff, please search the archives...
In a nutshell, many of these "cold air intakes" and cone filters designed to improve perfomance actually degrade it due to poor implementation. Many of the reusable filters sacrifice filtration efficacy for higher flow, and sometimes the results show in terms of UOA results, etc. Its probably not possible to correlate engine life to such a thing though...
JMH