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With test pipes you basically cut your primary cats off and clamp on the replacement pipes. With an X-Pipe you remove the stock exhaust system (unbolt) from the the header connection back just past the secondary cats and resonators. Note there are many different X-Pipes, some with quad resonators, some with resonators and high flow cats, etc. The X-Pipe config effects sound and smell. In the end a test pipe will yield similar output as an X-Pipe.
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