it wud be wise to rethink that statement as he said VQ30DET, not VG30DET. the VQ30DET weighs the same as a sr20det as it is all alloy, but has the same power as a rb26 from stock( or bout there, it a 3l turbo ! )
these engines are a bit rare tho, will have to import if u want a rwd from a late model cima. theres one for sale in da parts section tho