[Jac Mac]

Eljaro, If you were in the business of rebuilding performance / race engines and got to see the damage to cyl walls/pistons/rings from running them without airfilters on a more regular basis AND then had to repair that damage , I think you would change your mindset on this. There is enough work in building good engines without creating a reason to do it all again in a short time, still there are plenty of threads on this site from people who seem to like doing everything twice or even three times!!