In one of the older HPI issues they did a comparo between r32 and silvia,which has similar(identical?) performance to the 180sx.Based on their times,r32 does 0-100 in mid-high 6s and 1 1/4 mile in mid-high 14s.Silvia does low 6s and low 14s so its faster.The same article mentioned that despite being slower the r32 is in a different class, compared to s13 cars.The engine I belive is stronger stock for stock, and,unlike sr20 doesnt have problems with extended high rpm work.