| 5 inch mbrp turbo back lly
after i installed the exhaust on my lly duramax i lost about 4 mpg. i also kinda noticed a drop in power. the loss didnt happen until about 3 days after. i thought exhaust was supposed to up mpgs. im not sure if its the exhaust or what. about 8 months ago i had the same problem and it was my fuel getting air due to a bad seal on the fuel pump. does anyone have any idea why this is happening. |