I would either temporarily put on a regular exhaust system or find a way to have 2 cats put on the one pipe back. It sounds crazy but should filter it pretty good. Also make sure you dont have any CELs. Do you know any good car shops b/c they usually know people who can "pass"  your car.
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05 Srt4
Agp 3147 w/supporting mods
97 Mx-5
T28, hks man, ebay int/pipes, rfl bov, xtd 6 puck, 3" magnaflow, msd timing box,
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