Tried to replace starter this weekend on my 2010 GS 85k miles. When attempting to remove the O2 sensors from the exhaust manifold to get the heat shield off, only one sensor would come out. On the stuck one, i ended up using almost an entire can of PB blaster, a torch, some big leverage bars, and its only come out about 1.5 turns and no more :madfawk:. At this point i cant get to the starter, had to shut the project down for the weekend (which sucks because the eclipse is my DD). Im thinking my best route would be to go with a new header/exhaust manifold and say screw it cut off the stuck O2 sensor just to get that all out of the way, replace my starter, install new header, and have a performance mod after all the headache this has been. Now my question, i do not have state inspection in my area of WI. if i go with an aftermarket header, i know i will throw a code for the O2 sensor, but is the code the only problem? or will i have any performance issues associated with it? If there will be a performance issue, i may as well spend the extra ammount and get an RRE header with the spacers, and buy a new O2 sensor to replace the one i will be cutting off. I'd rather buy a cheaper header (i cant find stock exhaust manifolds) and not buy a new O2 sensor just to get this starter project done. Ive been reading on the forums, it doesnt look like anyone else has had THIS much of an issue with an O2 sensor, and I havent found an answer to the question of whether or not its ok to run without those 2 sensors or have them installed in a place thats not optimal like a cheaper header. Sorry for the long post, this has taken up my entire weekend:sad: and I need answers. Thanks for reading!