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^ it's true that gains are minimal from highflow cat -> test pipe, but when we do all sorts of things in order to get just a few more hp like underdrive pullies, why not do a test pipe as well.
another factor for me deciding this is lower cost.
the greatest down side is probably excessive noise, but my exhaust is very quiet at the moment, and even if the test pipe doubles the sound it'll still be ok for me.
regarding error codes, hooking up a spark plug defouler to the o2 sensor bung in the test pipe seems to eliminate problems w/ CELS. i remember reading this in a thread.
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