Went and bought a thread checker, tired of guessing bolt thread sizes. I'm surprised Enjuku Racing or ISR doesn't include this in their product information.
ISR Performance 3 Inch O2 Elbow (SR20) Studs: M10 - 1.5 40mm length. Nuts M10 - 1.5 (17mm hex)
ISIS Performance Turbo Manifold v2 (KA24DE) T2 bottom mount Studs: M8 - 1.25 45mm length. Nuts M8 - 1.25 (12mm hex)
I hope others find this useful for future reference.
Studs for turbo manifold. Idk why they're different sizes. The longer one is annoying with clearances.
Below the length of the stripped out stud from the O2 elbow.
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