Corksport Test Pipe with stock exhaust?

AutoEuphoria

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'08 CPW Mazdaspeed 3
Does this combo work? Is it worth it? I can't figure out of it bolts directly to the rest of the stock exhaust piping or not, or whether or not it's worth it before doing a downpipe, or if it only frees up power after a downpipe upgrade.

Any help would be appreciated. I like the CS one because the SLS one looks like it has a bit more restriction to the exhaust flow.
 
Yes the CS testpipe bolts up to the stock cat back exhaust.
Performance gains are there, but even more noticeable if you go with the CS downpipe - testpipe combo.
 
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