Well I own 2 2001 & 2003 SE model. They are from 3100 engine.
1997 SE catfish bumper 3100 & 3800 engines
1998 SE catfish bumper 3100 & 3800 engines
1999 SE catfish bumper 3100 & 3800 engines
2000 SE catfish bumper 3100 & 3800 engines
GT/P front bumper add SE model and 3800 engine option is dead.
2001 SE gt/p bumper 3100 engine. No 3800 engine
2002 SE gt/p bumper 3100 engine. No 3800 engine
2003 SE gt/p bumper 3100 engine. NO 3800 engine
That's how I learn other website. It is easy. If you see GT/P front bumper with SE model body so it is standard 3100 engine. Believe me, I'm right.