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Originally Posted by dsisco
my ecu already has powerchip software,
so u don't recommend removing the cats? losing torque is the last thing i wanted to do,
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I am not a scientist, nor do I play one on TV .
Again, however, it was my experience that going "catless" resulted in a significant loss of low end to mid range torque by virtue of the fact that there was hardly any back pressure left in the system. The astute exhaust designer knows that you must balance flow capacity with velocity . In some cases, reducing velocity by means of an exhaust system that is too free flowing can greatly impact low end to mid range torque . This is better explained through the concept of how delta pressure works. I am sure that there is someone on the forum far more versed in this topic than me.
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