i have an rs four s
it has a catback exhaust , gutted cat , HDI fmi . standard air box .defi boost gauge
when i fitted the fmi it would run an unstable .8 bar on standard boost controll and was not happy . surgey . hit boost cut a couple of times
i bypassed the stock solenoid and and swapped the waste gate actuator for a r32 one plumbed straight off the compressor housing , rock soild .8 bar car not happy . started pulling timing between 4500 and 6000 rpm
i now have standard waste gate actuator back on and old school avc-r boost controller . .7 bar and car is happy . goes hard . standard coils .standard ecu. what ever plugs came in it . 126000 kays . no hint of a stain above the exhaust 0-100 in 6.2 seconds