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[yzf-r1]

Originally Posted by Signal 2

Keeping a cat, preferably a hi-flow cat, has other advantages too. It helps quiet the car to a level where a stereo is functional. It also keeps the fumes from making your eyes water and smelling like a monkey's ass at high-noon.

I've been running a resonated midpipe for a very long time and I don't really notice the vapor/fumes all that much, perhaps I'm just used to it