Many times on drag cars, [and sometimes on roadcourse cars], even on some street cars, you see just a piece of metal mesh over the turbo air inlet hole. When i asked about this before everyone said this should only be done on cars that are rebuild every so often because it wears down the engine which is understandable. my question is what actually gets worn down and how do they fix it. i would think that running without a filter could cause small scratches in the cylinders, so what do they do? put new rings in, re-hone and call it day? im probably incorrect, how do they fix the scratches?

 

edit: wrong forum. for some reason i thought i was in Forced induction. maybe a mod will move it to the correct place since i can't delete it.