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Discussion Starter #1
Hi all,
I recently took my '06 V6 Mustang in to have it emissions tested for the first time (in California). The emissions place said that the test couldn't be completed because my O2 concentration was too high (i know what this means from a chem/physics perspective). I then took it to a mechanic to get another opinion and he suggested that my dual Flowmasters may be creating too high flow of a system, allowing too much O2 back in between strokes. Seems like a logical, but unlikely explanation to me. I wanted to get some other opinions before I scrap my nice aftermarket exhaust and go back to stock.

Here's my Setup:
Stock Manifold/headers and Cats
Changed the Stock Y pipe to two single pipes with Flowmaster Mufflers (not sure of series number).

Any thoughts would be appreciated
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