Honestly, you don't need a massive turbo to take advantage of a 3" exhaust. You'll be fine rolling around with a stock exhaust, but you will see more performance out of a 3" exhaust than you will out of a 2.5" or 2"*, even without some huge turbo. There are plenty of 3" systems that will be pretty quiet on an SR.
*(for the love of God, don't put on a 2" exhaust, you might as well leave it stock. That might even be the stock size, I can't remember)
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