I'm trying to control boost creep/spikes in an open intake/exhaust 95 RX-7 in ASP. It has a A'PEXi PowerFC controlling injection and boost already, but it can't keep up! Is it legal to replace the blow-off valve (e.g. A’PEXi Twin Chamber Blow Off Valve) ? How about add a separate boost controller (from the PowerFC) that externally controls the wastegate actuator (e.g. Digital AVC-R, from A’PEXi or Blitz DSBC Spec R)?
124 ST[S|X] - '89 Civic Si (red or white, depending)
24 HS - '89 Civic Si white
95 ASP - '95 RX-7 R2 (for fun days)