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I'm in the process of converting from dual to quad tips myself. You will need part #22829477 or #22829478, one is ZL1 and the other is 1LE, but they're the same part/price. The 1LE diffuser part you're referring won't fit 2014+. I picked mine up for $200 with core charge. I'd call around your local dealers and see if they have one in stock for a slightly cheaper price, otherwise, its pretty much the same ballpark online. Good luck.
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