Got the exhaust work done today and the car sounds great! I went ahead an had 2 O2 sensor ports installed post cat - I can always leave one capped if I don't need it. Now on to replacing O2 sensors. It seems like there's lots of discussion on NGK branded vs. Siemens branded vs. Bosch vs. BMW. Lots of price difference too - NGK is $75 vs. BMW which is ~ $250. |