If you have a socket wrench extended Allen key, that will work with a 3/8 driver - just to get it loose. Then you’ll need to switch to a stubby to get it out as you’ll back into the firewall. Remove sensors from the snorkel first! Ask me how I know…If you're talking about the hard plastic elbow that attaches to the throttle body, that bolt is actually a 5mm allen head. A mini ratchet and magnetic bit holder is what I use to get at that little bastard.