the sock on the end of the fuel pump should stop them if any get through the fuel filter should stop the rest but it is your decision if u have 2o in for warranty the dealer is going 2 make a very big issue out of it
he was visited buy the epa if u don't shut down the egr your tune won't pass just like ppei closed down their tune biz. and gde plus thourbred diesel sells no tunes and the egr is the main problem you can't ever buy delete pipes any where