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even with a turbo acting as a muffler, once you go catless header it's going to be awfully loud with an N1.. you could probably find a Perrin resonated CBE used for about 650. Its one of the better-sounding exhausts out there IMO. Invidia Q300 is about that much brand new.
If i were you, I'd stretch the budget a bit and pay for a properly resonated exhaust. This car really isn't powerful enough to warrant the volume from an N1. Just my 0.02.
As far as the diameter.. you probably wont run into a great deal of restriction from just the catback. A lot of guys like to run the 3" pipe all the way back, but 2.36" (thank you google conversion) is still wider than stock so as long as you're tuned properly post-turbo I don't see it being a problem.
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