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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.
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.
