Might be a stupid question, but what is the benefit of having a twin turbo setup? Seems like a lot of extra work, weight, complexity and cost.

Respect for being bold enough to try something new/different!

typically a twin turbo...
 

Twin turbo allows you to use smaller turbos but get the same (combined) airflow at the same boost levels as a single bigger turbo.

This means quicker spool times usually and will give you a broader power curve.

The downsides are complexity and more points of failure.

Jaden

So if you're spooling at 3800-4000rpm and making 300ish HP why go through the complexity of a twin setup when there's other kits that build boost sooner but make the same power? Because racecar?

Better transient response? Twincharging is better for actual performance. More usable and broader torque. Supercharger for mid-range and turbo up high is the way to go. Just ask Enmo Racing.