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The real question is will a 3L upper benefit your SVT. The SVT upper measures 30mm primary and 32mm secondary. The SVT lower is 33/35, with the cylinder head ports being about the same (pretty well port matched). But, the intake valves are only 32mm so the ports must taper down. A bigger upper (either 3L or further Extrude Honed 2.5L) may just result in lower gas velocity and possible power loss (with standard SVT cams). Or maybe it will gain flow & power. Unfortunately, I dont think we will know until someone does this and dynos.
