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Catless Si ebay downpipe?
If you were to install a T1r style downpipe, could you simply leave the rear o2 just in free air? I have heard that this works. anyone tried it? Also, how is it known that the car doesnt compensate for incorrect values associated with the removal of a cat. Even with the Defouler some say that the light still comes on. I have experience with downpiped vehicles but never did a before and after with a wideband. What I would like to see is a datalog or at least some information on what the A/Rs were before and after a downpipe install.
I have heard what they sound like with stock exhaust on a video, but I cant tell if its raspy or not in person. anybody have this setup? thanks. Also I did see the dyno of no real major gain after install, but the question is did the car have time to adjust for the now additional flow? I would imagine it would take a little while for it to adjust but I have no factual data to prove or disprove that this would change any power output.
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