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Would like to get your impressions on these downpipes, catted preferably. Notice in power? How's the quality of the workmanship?
 
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The Mach 5 website is dead which isn't a good sign. They don't state any specs about the catalyst they are using. Most of the major companies in the market use HJS HD catalysts which reduce the chances of a check engine light to nothing and are built to last even for track use - and there is a good reason for it. Off brand catalysts offer questionable quality, and the catalyst may blow out or burn out.

-Mike
 
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