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I don`t know how much horsepower the 1.3L makes but I would google exhaust sizing and see what you find. The smallest I have heard of for exhaust shops is 1-7/8 inch tubing. Most smaller displacement vehicles get that ricey sound from the exhaust. I would have a exhaust shop custom make me an exhaust from 1-7/8 tubing. The tubing more than likely going to be crush bent anyway and restrict the flow down which is fine because the tubing is more than likely slightly larger than needed. I would get a resonator and a muffler with as much packing as possible so it does'nt sound so ricey. I prefer a straight thru design like magnflow over other designs to keep engine pumping losses to a minimum.
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