Are you talking cat-back? or literally from the turbo back? Because there are lots of options out there. Look into Clear Image Automotive... You should be able to google them. I've bought my piping from them and they're a great company to work with.
I dont know of any kits but i know that turbotechracing.com has the HAHN downpipe and exhaust.
Check them out
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Cobalts SS
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