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Removing the cat will make the exhaust more "smelly", which is maybe why you notice it now. After removing the cat, I can smell exhaust through the heat when stopped at traffic light, but not when moving. I presume it is exhaust whafting up from the dual tailpipes in still air and getting sucked up by the fan. It likely always did that, but wasn't that noticable with the cat on. So I just turn off the heat if stopped for long.
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1986 3.2 to 3.4 conversion
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