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Originally Posted by RobBeck
Thanks for doing this test, it should be clear now to all of those who said the stock catback was good up to a much higher power level, that they were incorrect. I always figured just by looking at it that it was a POS.
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That was my main motivation in doing all this - refuting the old myth floating around that the stock catback is good. I figured that as long as I had the sensor and logging capability to do something like this (thanks AEM!), I may as well take some before and after measurements along with making my new exhaust.
Up top at 7000 RPM with the stock exhaust, I actually had as much pressure in the exhaust system as I had in my intake manifold (13 PSI). That's just nuts. I still can't believe there was that much backpressure.
