It has 4 and there all screwed into the exhaust system. There will not be any after the muffler. There about 3 to 4 inches long with an electric wire hooked to them.
There are two. One on the exhaust manifold and one just after the Cat. www.trailvoy.com Trailblazer enthusiasts website!
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No
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try this website --->www.trailvoy.com<--- they have alot of stuff to help you with your trailblazer i should know im a member my self i have a 2003 Chevy trailblazer Lt www.trailvoy.com
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