Originally Posted by Roadk9

@gelbm3 Here is some more info for you: A lot of guys worked to get this info.
Mostly taking their cars apart to upgrade them. Just like you.

OEM PP Shock Tower Brace: 7.6lbs

OEM PP K-Brace: 10.4lbs

OEM Front Subframe (K-Member): 58.2lbs

OEM Rear IRS Subframe (Empty): 55lbs

OEM IRON Diff Housing, Loaded - No Fluid: 99lbs

OEM IRS Halfshafts: 21.1lbs/each
FRPP Halfshafts: 30.2lbs/each

OEM Rear Lower Control Arm: 15.24lbs - each

OEM Rear Upper Camber Link Arm: 4.65lbs - each

OEM Vertical Link:
BMR Billet Vertical Link: 1.8lbs - each

OEM Rear Toe Link/Rod Arm: 2.42lbs - each
BMR Adjustable Toe Rod w/ Lock Out Plate:

OEM Rear IRS Cradle Mount Bushings: 1.05lbs - each
BMR Delrin Cradle Mount Bushings: .50lbs - each

OEM Rear IRS Diff Mount Bushings: .90lbs - each
BMR Billet Aluminum Diff Bushings: 1.47lbs - each

OEM Rear Lower Control Arm Bushings: 1.1lbs - each
BMR RLCA Bearing Upgrade Bushings: OEM EPAS Rack: 36.46lbs

OEM Motor Mounts: 3.9lbs - each
BMR Adjustable Motor Mounts: 1.9lbs - each

OEM Windshield Washer Fluid Res. w/ Fluid: 9lbs

OEM Battery: 31.31lbs
Deka ETX18 - 17.67lbs

OEM Catback Exhaust: 72lbs
Magnaflow Comp CB - 44lbs

OEM GT/V8 Passenger Side Header: 10lbs.
OEM GT/V8 Driver's Side: 19lbs
Borla GT/V8 Longtube Headers: 14.2lbs per side

OEM Base 18" GT Wheel w/ Tire: 54.5lbs
OEM PP Model 19" GT Wheel w/ Tire: F-60.6lbs / R-64.3lbs
OEM Dark Stainless Painted Aluminum 19" x 8.5" Wheel w/ Tire: 57.6 lbs
OEM Premium20x9 Foundry Wheel: 35.7 lbs
Billet Specialties 17x4.5 w/ MT SR 28" Radial - 39.8lbs
Billet Specialties 17x9.5 w/ MT 28" Drag Radial - 51lbs

OEM GT Cloth Seat: 50lbs
Corbeau FX1 w/ Bracket - 21.7lbs

OEM "Mid Pipes" w/ Cats: 22lbs
MAK O/R Pipes -

OEM GT Base 14" Front Brake Kit (Rotor/Caliper/Pads) - 43.8lbs per side (87.6lbs total L+R)
OEM GT PP 15" Front Brake Kit (Rotor/Caliper/Pads): - 47.2lbs per side (94.4lbs total L+R)
Aerospace 13" Lightweight Street Brakes (Rotor/Caliper/Pads/Brackets) - 19.4lbs per side (38.8lbs total L/R)

OEM GT 14" Base Front Rotor: 28.56lbs (57.12lbs pair)
OEM GT PP 15" Front Rotor: 33.4lbs (66.8lbs pair)
Aerospace 13" Lightweight Street Rotor - 14.3lbs (28.6lbs pair)

OEM GT Base Front Caliper: 15.24lbs
OEM GT PP Front Caliper: 13.8lbs
Aerospace Lightweight Front Caliper - 5.1lbs (10.2lbs pair)

OEM Front Sway Bar: 12.7lbs

OEM Front V8/GT Coil Springs: 4.8lbs - each
BMR Drag Front Springs: 3.95lbs - each
BMR Performance Front Springs: 4.8lbs - each
BMR Min Drop Front Springs: 4.75lbs - each
BMR Handling Front Springs: 4.8lbs - each

OEM Rear V8/GT Coil Springs: 9.7lbs - each

OEM Front Sway Bar End Links: 1.6lbs pair
BMR Adjustable Front End Links: 2.2lbs pair

OEM 2-Piece Driveshaft / Auto: 29lbs
OEM 2-Piece Driveshaft / Manual: 36.2lbs
Shaftmasters Auto 1-Piece Aluminum DS - 19lbs
DSS Auto 1-Piece Aluminum DS - 27.6lbs

OEM Front Spindle/Hub Assembly: 19.3lbs each

OEM Front Control Arm: 4.3lbs each

OEM Front Radius Arm: 6.8lbs each

OEM Front Tie Rod: 2lbs each

OEM Tire Air Pump: 5lbs

OEM EVAP Module/Canister

OEM Engine Sound Tube: 1.3lbs

OEM Engine Coil Covers: .75lbs/each

OEM Engine Cover: 3.4lbs

OEM Battery Cover: 1.23lbs

OEM Plastic Trunk Latch Cover: 2.40lbs

OEM Rear Seats: 30.8lbs

OEM Rear Lower Seat Cushion: 11lbs

OEM Trunk Carpet Cover: 4.6 pounds.

OEM Stock Floor Mats: 2.6 pounds.

OEM Carpet / Complete: 16.5lbs

Originally Posted by Sarge

Does anyone have any experience with a carbon fiber hood?

I was at trufiber.com browsing for S550 parts and saw they had a 40 lb fiberglass hood for $800, a 30 lb carbon fiber hood for $1800, and a lightweight 17 lb carbon fiber hood for $1800. That's a fair chunk of change for me and doesn't include paint, but it is a big weight reduction, and it's right over the front axles. If someone knows the OE hood weight, we can do the math and see how close that gets to 50/50.