02 Max w/ Banks six gun and speed loader, straight stock pipe, old AFE. I don't know if it is coincidence or if this BS low sulfur fuel is doing it but with 122,000 miles my truck smokes (gray smoke) like crazy. I'm thinking injectors are bad or clogged. I've also noticed a little less responsiveness. Only getting about 15mpg at best, running 305/60R17, 2" block and 2" up front. Looking for opinions.