Tsudo si exhaust 3 piece or 4

Bulkybear said:
View attachment 36844

The cannister in picture 1 is the first catalytic converter aka the downpipe. The cannister in picture 6 is the 2nd catalytic converter that the tsudo test pipe replaces. There is an o2 sensor for each I believe but not sure if its upstream from the cat or not. The cannister before the muffler but after the 2nd cat is the resonator. All it does is supress sound and remove resonance so its not raspy. Kind of like a straight through high flow muffler.

Aftermarket downpipes replace piece 1 and 6. Test pipe replaces piece 6. Catback replaces everything after piece 6.
Click to expand...
its before the catback is all im saying. the catback you buy from tsudo is a cat back.
 
rv6-civic12-downpipe_1.jpg
As you can see there is a pre and post O2 sensor. One is positioned on top of the bell mouth (PRE O2 Sensor) and the second is right before the secondary cat on the right side you can see the o2 bung there (POST O2 Sensor). The secondary CATALYTIC converter is just a different type and or design. Kinda like a 3" Magnaflow Universal 59959 Catalytic Converter its a High Flow Spun Metallic cat "Style"! Also @AlienPrime if the Tsudo was a cat back exhaust and that secondary cat you claim is not, but just a resonator then Tsudo's exhaust would bolt up to or right after the first Cat because As you can see the factory down pipe is two pieces, not one!

Thanks!
 
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