wildcatblue
Bronze Member
No, the turbo is not used for emission purposes, injection pump timing yes, if that were the case then why offer 2 engines one with and one without..in the future dual turbo and dual EGR's may play a hand down the road but I don't think so, to much cost,DEF will prevail as it is allready. unless your Navistar/ trying to meet the emission standard by paying 1900.00 penalty's each on their engines that don't meet tier 4.