What happens when you get to 4K RPM's? Are you getting fuel cut and the car falls flat on its face, or does the car just stay at 4K RPM's and refuse to go any higher? Does the car idle normally, and drive normally under 4K RPM's?
More info please..
1999 Eclipse GS Built motor Hahn 16G Turbo w/ FMIC Hahn Stage 5 Portfueler (270's & 500's) Zeitronix Zt-2 wideband w/ 3.5bar MAP 3" SS Turbo Back CM Stage 4 Clutch and Fidanza Flywheel Baer Big Brake Kit