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The diameter on the cat seems small? And is there only one hole on the cat as i thought there should be two (or is the first post on the manifold itself?)
if its the one on ebay, advertised by marv then it wont fit a sport, as the exhaust inlet diameter is too small. could obviously be modified by powerflow to fit, but they wont like doing it lol.
they weigh next to nothing. try taking it to powerflow to see what they say about fitment. i have had to go with a 200cpsi rating on my 1.2 in order to retain sufficient torque to drive lol, but on a 182 this wouldnt give you as good as gain as opting for a 100cpsi one.