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  1. TrailBlazer / Envoy Chat
    hey i got a thrush/dynomax muffler single in/dual out 3inch , 4inch tailpipe, i want it more louder, so i went to muffler shop, he said he could cut cat out and put a pipe in there and an o2 sensor, total price about $140. and there's a chance that the check engine light will still appear, so...
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