Target lambda values are not being maintained, with actual readings showing lean conditions especially in mid-range RPM. Boost control appears stable but fuel delivery isn't matching demand. DME corrections active but unable to fully compensate. Despite full bolt-on setup (Dinan CAI, BMS RACE IC, ER Chargepipe, AA Downpipe, AWE Exhaust), fuel delivery appears compromised. Actual lambda readings deviating from requested values by concerning margins, especially under load. This pattern suggests potential fuel delivery restrictions or pressure regulation issues.