im just saying in general.. the prices are cheaper for the unliked 4 bangers.. as in coilpanks cheaper GKtech have full turbo back exhaust for 400 new.. turbos are cheaper most of the time for say T2 flanges. pfcs are cheaper.. only cause they are more common on the SR u can pick up a redtop SR pfc for 4-600 and here a R33 gtst one goes for 1250 in a matter of hours.
also clutches and boxes cheaper.. diffs cheaper. yes they are weaker but less weight play a part in the design..