Plenum cross section vs tb cross section

HI guys does anyone know the cross section of the stock sc plneum ? I understand the tb is 60mm, but i wondered of the plenum opening was the same size.

The actual throttle blade is 60mm, but the TB is tapered, and the flange cross section is about 64mm. The average cross section of the plenum is 65mm. A 65mm TB would be a bolt on, anything bigger requires port matching the openings, although the stock inlet still necks down to 65mm inside.

worth it ?

In that case im just gonna go with an after market plenum.