Over $6000 to install TTI headers on 66 Barracuda

I think the OP may not have anything in writing or we wouldn't be having this conversation! I would also go get the car, see what's really done to it, and just take it from there! Get the car though, and don't take no for an answer! If he refuses to give the car back before payment is made, call the cops in! Jmo, Geof