Ralph, Kuch, Kyle and others who post or agree the 1.6 is more expensive to build...please remember your not always preaching to the choir! New members come and go here all the time and these statements can be misleading if not put into the proper context!
Assuming one buys a donor(NA or NB) in relatively equal condition, (NB will cost more)Minus the motor...I see ZERO difference in the cost of a new build. The NA will have to buy an intake and a diff(comp or torsen)which will get it back close to the cost of a NB donor. From here all the rest is the same for the most part.
Now the motor. Here is where the difference can lie in the "Top Prep" argument. Both donor motors are dropped off at the "Pro" builders shop, built to the letter of the rules, and dropped back in the car. 95% chance the NB motor is going to be within 2-3 hp of the best legal motor out there with all its original donor parts on the car as it breaks in. The NA motor on the other hand is probably closer to 25% being even close to the best 1.6 motors with all its original donor parts back on and in the car.
So why?? Stock parts that flow air!!! There is a difference and the unrestricted NA motor is only going to be as good as all its parts combined! The restrictor in the NB motors for now is taking away the need to bin match or find all the best "flowing" parts! Though dont kid yourself that all the top guys and their builders are not doing this!
I think some of the decriptions of "WAY MORE" to build a top prep 1.6 car are overstated. But no doubt, top level 1.6 "MOTORS" can cost more to get there when you have to find 5-7 items that flow the best!