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· Oh, Herro!
3,414 Posts
From the manifold back will delete the cat, which is really bad for the environment, has almost no performance gain, will make your car fail emissions, and will throw a light. A cat-back is, well, from the cat back, keeping the cat in place, which is good.

BTW = 2" seems to be the best diameter for the 1.6l motor, which I'm assuming you have. 2.5" will cause a noticible loss of power in the low-end.
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