To my understanding without emissions I'm able to make the A/F ratio a little richer, which is what causes a car to fail the carbon test no? I was thinking of getting test pipes bit I'm really satisfied with the sound of my car and I'm afraid test pipes will give me more of a raspy sound. Also, somebody mentioned that the back pressure provided by hfc vs test pipes are more beneficial with boost. I'm not too sold on that though
11' 370z TT
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