Started my install of long tube headers. Everything went well got them in. 02 sensor ya they are the devil. The 2 on manifolds (upstream) ya they sucks. They are seized to add the shop the army has here does have that many tools and got quoted 700 euros to install. Did it my self now I have headers on without the 2 manifolds sensors. They started stripping with the wrench, obviously no one carries that here in Germany. Advise on getting them out? Plug? Good bad? Worst this Friday I have a major event for the car and running out if time!