2017 si exhaust tip

[Donk232]

I can not find the diameter of the dual exhaust pipes after the mufflers. I would like to replace my stock HDMI tip while keeping stock muffler and resonator with something like a borla resonated tip, maybe a mini resonator or even a fart can or 2 to help bring exhaust sound down post Fp/Dp.

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[Zahir]

I want to do same. Preferably a quad tip if available. Have have to go approximately and measure it. At first I wasn't sure if the muffler and the tips are welded but they arent lol.