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Does anyone have a good thread on how to change a Cat Converter for a 2003 Trailblazer. Also, any opinions on a direct fit vs. weld on type?
 

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If you have access to a welder, either stick, mig, or tig the weld to fit is a lot cheaper. However, if not, the direct fit is pull bolts on both ends and put in the new one and tighten the bolts on both ends.
 
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