POP charger comes from my 1997 Nissan Maxima, made by Stillen for turbocharged cars. They copied it from Jim Wolf. Basically a big velocity stack that goes from 5 inch diameter to 3" inch diameter. As to what POP means? lost in time and space.
On my Maxima it helped the mpg a little bit as the filter is just as restrictive as the buick. basically the car had more power so it did not have to down shift going up hills.
The plugs and wires helped a bunch.
After rereading the TB/MAF cleaning article I am thinking that might be part of my issue. I have a hunting idle at the moment. The wires and plugs cleaned up some of it. Plus replacing all the rubber hoses.
i also have a issue where the car cant make it up long hills at 75 without down shifting. One of the reasons I bought this car was that I figured that I would get at least 25mpg. So I need to fix this.