What are the chances of getting a thread that talks about known OEM Item weight vs. replacement part weight. I spend a lot of time talking about how to get more power to pull the weight and I know that isn't cheap once you get to a certain point because I am there. I don't know what is cheaper increasing power to weight ratio or decreasing weight to power ratio.....
The usual path guys who are serious about (drag) racing follow is to gut the interior, delete the rear seat, remove the front sway bar, relocate the battery, remove the A/C, power steering, windshield washer system, strip the wiring harness of non-essentials, add smaller minimalist brakes.
Road race guys don't skimp on brakes and they keep the front sway bars intact.
My two cents is that most of us on here drive Roushes, and a Roush is a cut above your normal GT in terms of style, suspension, and the added Roush accessories add weight: thicker sway bars, carbon fiber kit, etc...Personally, I am not willing to sacrifce things to lose weight.
Some ideas that are non-destructive:
Move your battery fom the hoid to the trunk or more weight over the rear wheels.
Add a BMR K member and A Arms
Consult BMR concerning adding a light weight rad bracket / front support. Steeda has products for this area as well.
Add an aluminum or carbon-fiber drive-shaft
Buy lighter-weight wheels