basic stuff needed to achive 300bhp on a wrx is-
Full system without cats,
Sti i/c v2
pump 255ltr,
Panel filter. dont get sucked into needing a Ind kit thoses maffs dont last.
remove the air resonator box,
you are at the max point on injectors so id be looking for 440s or at least use a fuel reg at 3.5bar
v2 z4 ecu may see you there or get a mapp job done
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