Like someone else said with a turbo there is no need for the exhaust to make the engine have any back presure bucause the turbo takes care of that and takes out some of the harshness of the sound. I would say to drive it around with no resonators untill you get pulled over and have to fix it.. definatly a cat and a muffler is all you would need unless you are saying you are just going cat and resonator.. then try it with just the cat for a week or so and see how it sounds.. wouldnt cost that much for someone to put a 3" galss pack on or a resonator.. I would not put any resonators on .. My .02
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