The process is slightly different for us that have the 3.8 Supercharged engine. There is a vacuum line that goes to intake AFTER the superchager, thats the one that I used when I had my 97 Regals GS. Same motor that I have now in the MC. Btw, it did smoke alot. It smoked so bad it looked like mosquito spray truck going down the street.

 

I was kinda disappointed no smoke show but happy to see my baby healthy lol

 

Oh I forgot to mention I didn't seafoam my throttle body cause I already cleaned it the old fashion way. Took off and clean. So my intake, engine , and plugs are clean. I was reading ls1, and some ls4 members have the same plugs for over 200k miles cause the stock ones in le4 are supposed to be really good. Shocker to believe!! I dunno about that but seafoam is a nice cleaner