Like redondoaveb mentioned - FI sells exhausts with mil-spec cats farther downstream. Alternatively, you can just buy mil-spec cats and have any 'jim-bob's mufflers and handyjay's' type of shop weld them in for you. There are definitely cats out there that an handle the boosted environment, just none off-the-shelf for our cars since <1% of hobbyists would want them.
Turbos are actually very effective mufflers as it turns out. My car ended up a lot more quiet than I thought it would be... though I am running the Invidia cat-back which I believe is on the quieter end as well.
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