99% of the costs are the same for every year; roll cage, seat, belts, wheels, tires, springs, shocks, sway bars, bushings, trans, clutch etc. Assuming you start out with equal condition donors, any year built to the same quality will be pretty darn close to the same price. 1.6 cars are older and generally need some extra TLC to make them equal. They are also more finicky on set up and tuning. But the build cost is the same +/- $1500
Dave
Just goes to show you how supply and demand drives the price point! Be it new builds or used cars!