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I'm going to install a high flow catylitic converter welded to some custom piping to replace my mid pipe (part of a combo with a header)...I looked up the stock exhaust scematics for the 6i and saw that the Catalytic converter, a 3way cat w/o air, has one of the two O2 sensors located in the middle of the Cat. should I buy a high flow cat, will it make a difference if I buy a cat with the sensor in the middle or without sensors and have the O2 sensors moved to either side of the cat. I found that magnaflow makes Cat converters with an O2 sensor in the middle, but my exhaust shop sells catalytic converters right there, and I wouldn't even need to worry about ordering one...facts, opinions (useful ones), suggestions? Appreciate any help, thankyou.