been running BC V2 on my ISF and my 350
definately better than stock
much more controled
u really dont have much choise on coilovers for the ISF
for 4K id imagin it will be KWV3's
BC are good but not as good as KWV3
but for 1300-1400 new for the BC compared to KW
the KW's are not worth the extra 2.6K on top of the BC's