hi everybody

my dilemna is :
i have a Rx7 S5 turbo
with old turbo
i just bougth a S4 BNR stage2 (ported wastgate) low miles + s4 header

so, my question :

what's the best ?

put in the car
- all the S4 part (turbo+header and what i do with the scroll valve)
or
- the S4 BNR with S5 hot side (wastegate ported but old not a perfect close, lil'play) + S5 header

thanks

sorry for my french english

 

i would think putting it into the s5 turbine housing is easiest and best
( provided it is using a stock or stage 2 t3 turbine wheel )

the s5 turbine housing has the twin wastegate ( for either runner ) and would think that even stock it matches a mostly enlarged s4 wastegate