Ok, I'll take your word on it. I only look at inline 6s (may be different for other engine setups) and its usually one right after the manifold to the cat and one after, sometimes a 3rd in between 2 cats. This sort of setup makes sense to me for modifying A/F ratios to reduce emissions.I don't know, but that's not something unique to this car. Every gasoline car for the last 10 years or so is set up the same way for the US market.
So if I take a peep through that second sensor hole there should be a gap of some sorts or break between the two cats?Hi guys. Yes, there are two cats in the factory downpipe.
The primary cat is circled in blue in the pic below, and the secondary cat is circled in red.
There is an air gap between them, and the second O2 sensor is at the yellow arrow. That sensor monitors the primary cat. The main O2 sensor is at the green arrow.
If you look at the pics posted above by a90moe, you can see the cat he is referring to after the corrugated section in the picture looking up the downpipe.So if I take a peep through that second sensor hole there should be a gap of some sorts or break between the two cats?
Any evidence to back this up?
F8X for instance had the secondary cats at the mid pipe
I don't want to dissect my DP for science