What type of catalytic converters does the BJ Protegé use? What effect do they have on modifications to the exhaust system?
All U.S.-model BJ Protegé’s use a “can”-style primary catalytic converter that attaches directly to the exhaust manifold, right behind the radiator. The primary and secondary O2 sensors attach to the exhaust system immediately before and after the primary converter. After the primary converter, there is a cast-iron downpipe (referred to in the service manual as a “connecting pipe”) which wraps under the oil pan and ends directly behind the engine. After the downpipe, 99-00 Protegés sold in states other than New York and California (referred to as “48-state” cars) use a single-piece exhaust system that incorporates two mufflers. The first muffler is a small resonator located under the front seats (sometimes mistaken for a catalytic converter); the main muffler is located at the rear of the car. Aftermarket “cat-back” exhaust systems for 48-state cars replace the entire system after the downpipe. 1999-2000 Protegés sold in New York and California and all 2001+ Protegés use a 2-piece exha
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