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For S#7$ and giggles, I ran a traditional exhaust size calculator and it said that a single 3.15" diameter pipe can support 407 BHP, but I think that calculation is based upon assumptions that only apply to NA engines. I think the higher pressures in the exhaust of a turbocharged engine change...

8. ETS Extreme Turbo Systems Catless with 4.0" outlet for use with their 4" to dual 3" Y pipe. $445 https://www.extremeturbosystems.com/products/ets-2020-toyota-supra-downpipe?variant=29606559809606 -I'm really interested in a discussion on whether / when people think that changing to a 4"...