I'm trying to determine if I need to mod my TTI x-pipe exhaust if I have the Gear Vendors over drive (Part #3DFS727A) installed on my 727. Anyone gone through this?

Here's what GV said:

"From the center of your yoke, measure down 4.25 inches from the centerline, this is where our oil sump sits."

I know I have to have the tunnel bumped out a bit, but the exhaust mods, if needed, might be time consuming and I can't picture them. Obviously, the loop will have to go.