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I can't find the article but an Australian tuning shop did a full turbo 86 build for professional rallying. It was a pretty extensive build blog and 86 breakdown, I wish I could find the article. They are using the stock catback and they did a big build. If you go bigger you will change how the power hits, but you won't gain anything.
The stock catback is more than enough for your build according to thier build. You can do it for looks or for sound but the stock catback is more than enough to make all the power you need.
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