Smd1122

I'm replacing my complete exhaust and was wondering if replacing the header with a high flow will affect the O2 sensors on the header since the new header will not have catalytic converters? I know I will need to buy a O2 spacer or delete for the downstream O2 sensor. What about on the header?

1997Soarer

iTrader: (1)

The 2 primary O2 sensors will be ok. The 2 secondaries will not. You will need spacers or sims for them

01MSMSXE10

Yeah, you'll have to simulate the b1s2 b2s2 sensors with an O2 simulator.