Heard a clunk when I shifter into 2nd gear and let the clutch go kind of hard. Nothing crazy but I heard a clunk. Shifted into 3rd a little softer and no clunk. Suspension maybe or a mount? I know it's not the engine. I blew a k20a3 back in the day.
After work I checked out my suspension and found the orange blocks on my driver side. The sound must have been from it bottoming out. Hope this helps out feature owners.