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Just to put this into laymans terms so everyone understands the difference...a spacer moves the o2 sensor further away from the exhaust gasses, giving you a better chance of the sensor not causing a CEL. A mini cat not only acts like a spacer, but it also cleans the exhausts gasses before they reach the O2 sensor, just like an OEM cat. Being that it's difficult to reach and I don't like crawling under my car all the time, I paid the extra money to buy a mini cat, as it is going to have a much better chance of not throwing a CEL.
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