96 WS6

Okay basically, my car is a big fat pig. It weighs a lot especially with my 100 pound box/subs in the trunk. It feels like it has lost low end power and it feels like the weight is bogging it down. Also, on the freeway, I want it to rev a little higher when crusing in sixth.

Where can I get GM motive 373's for cheap and will they do what I want them to do? I just want the car to feel lighter off the line and just lighter in general without removing all types of ****. I already removed all the usual stuff and I did the A/C delete recently but I need more. Thanks.