I am getting a catback for my 97 civic ex. I was wondering if i should go for the Greddy evo 2 for $450, or obx type r for $275.

greddy. the obx is too loud, and the fitment is questionable. the greddy will give you more power too.

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Yes, there's a "Replacement for Displacement". Its called Volumetric Efficiency.