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Okay, I ordered a test pipe to replace my cat and the consensus seems to be that I wasted my money and should have just gone with a hi-flow cat because the test pipe will make me lose power, or at least torque. So here's my stupid question of the day. How come not having a cat doesn't affect older cars or non-import cars? Exhaust uses the same principles if i'm not mistaken no matter what vehicle it's on....so I guess I just don't understand how getting a less restricted flow through the exhaust could be a bad thing. Catalytic converters haven't been around forever and to my understanding are only an emissions device and that's it.

Again, i'm not arguing any facts what so ever, just trying to get a straight story...Thanks

 
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The concensus is that the restriction on a civic is not the exhaust. It is the head and valve assembly. The stock exhaust is enough to handle the stock air flow. Modifying the head and valve will help more but gets expensive and complicated.