Suitable Exhaust Size For An N/a R32?

[ClutchBurndout-:(]

no it doesn't. the reason why NA cars need smaller diameter exhausts isn't because of a need for backpressure. this is a myth. the reason they need smaller tubing is all about exhaust gas velocity and the scavenging/syphoning effect that happens. backpressure is a byproduct of smaller tubing and is bad for both turbo and NA engines.

maybe ill just shut my big mouth

[-Jimmy-]

Same.

What is the stock exhaust diameter on the RB20DE/RB25DE? I've never actually checked myself but assumed it was 2".