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Hey guys I have a 07' Charger SRT8 and I'm looking to buy the Magnaflow 16420 Hi Flow cats. I want to know if removing the stock O2 sensors are an issue to remove? I heard some guys say that you will most likely strip the threads on the O2 sensor on the way out because they don't use anti-seize on them when they install them at the factory. I don't want to end up buying 4 new O2 sensors and driving around with 4 holes in my exhaust till I get new sensors.

Also, how much more louder will my exhaust be at idle or how much more tone will I get? Right now I just have a cold air intake, a custom 3'' cat-back exhaust where I deleted the rear silencers and replaced the suitcase muffler with 3'' stainless steel Mososo Spiral Flow mufflers (sounds amazing, no drone at all!). Then I just have the stock cats and exhaust manifolds.
 
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