The true inside diameter of both the OEM intake elbow and 4SRC titanium kit:
OEM IN: 62 mm OEM OUT: 59 mm (at turbo)
4SRC kit IN: 68 mm , 4SRC kit OUT: 63.5mm (at turbo). Both use a 2.75″ inlet, so all of the aftermarket intake systems you are currently using will fit.
product is hand torched burnt, colour may vary slightly.