First things first.....
Welcome to BonnevilleClub :P
well, here goes
You CAN install that on an SLE, but you would need so much work it ain't even funny.... LIM from an SII L67 ( Series II supercharged 3.8 )
Trans is slightly different, mounting brackets for accesories, harmonic balancer, not to mention PCM and some wiring in the harness is different.... Yeah, it takes a ton of work to do it and make it right. It is honestly most likely cheaper to buy an SSEi unless you already have the SLE and can find an SSEi engine, trans, PCM, and wiring harness...
In the meantime, you can check out www.intens-racing.com
for some upgrades for an SLE. We have had a few members get stuff from them for their non - supercharged cars and been very happy