Test pipes will give you marginally better gains and will help the tuner with consistency. Also they'll be louder, but that's heavily dependent on the cat-back you have installed on it.
High flow cats give you slightly less gains, but you won't end up smelling like your car every time you drive it. They provide more sound to the car as well, and are still a significant improvement over the stock cats.
if you use the "the370z" ahead of any term in your favorite search engine, it will pull up relevant threads in the forum and make it easier to find stuff.
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