i need to replace my O2 sensor for my 94 GSR, and i went to the local auto store and they have a stock replacement for 150, 100 cheaper then the dealer, then i went to the NGK site and they want 65 or so for a new O2 sensor...my question is is this O2 sensor the same quality as stock, or is it the same as stock because the car comes with other NGK stock parts?....thanx in advance