Hello, I've had this same issue for about 1 year now. I have an 02 with 58,000 on it. I took it in under warranty and dealership replaced the supercharger(parts $1800)and no charge because of powertrain warr. Anyways, tech asked me if I ran anything under 91 octane in it because it would trip the bypass. I always run 93 and had belts changed at 30,000. Nonetheless, I still have the issue. Seems to occur once it has warmed up and between 1800 to 3800 rpms.It's a really bad lag.