vtec4thgen

I have a 2000 prelude h22a4, jackson racing supercharger and fmu are the only mods. the supercharger has been on for 5-6 years. no problems at all until recently i noticed the car lacks power and surges under acceleration. also the supercharger seems to be noticeably louder than before (Might be in my head). with the belt disconnected, the car only has slightly less power and does not surge! Help please! is this an fmu problem or jrsc problem?

The car does not have an a/f gauge or fuel pressure gauge.