OK guys any pointers on install of a turbo back straight pipe? I bought a Expandit 4" from Diesel Dawgs. I used to work at a shop and remembered the turbo down pipe sucked on the older 90's trucks. Remembered having to modify the firewall. I have never installed turbo down pipe on 99 and up. Don't know how much room I have to play with or anything. It has the orginal exhaust on it, I was just gonna saw it off. Also bought the S&B? fresh air intake. gonna install it as well.