Like someone else said just trade in the V6 Alero for the 4 banger. Engine swaps are expensive so it would be cheaper to just trade the V6 for the LD9. Personally I wouldn't trade in a V6 for a 4 banger unless you planned on supercharging the 2.4. The V6 has plenty of power unlike the 2.4. A stock 2.4 lacks get up go. I would keep the V6 Alero and build a custom turbo.
