Ok because of some race you had you now know the difference in weight is 148lbs? You sir are one hell of an engineer :stickpoke
I'm sorry but I didn't just pull that number out from anywhere but from articles that have credit. Here is one for reference
1999 Ford Mustang Review - The Car Connection
It clearly states that the difference in weight is 80lbs
No Actually I pulled the number from weighing the vehicle of two friends of mine who have removed the IRS on their 2003 Cobras and installed a solid rear axle.
Here is the definition of Unsprung weight you might be confused.
(mechanical engineering) Unsprung weight= The weight of the various parts of a vehicle that are not carried on the springs, such as wheels, axles, and brakes. These were also all different on 03 04 Cobras except the wheels which were different but have nothing to do with SRA since you would install the same wheels.
The 1999 IRS assembly weighs about 80 pounds more than the solid-axle setup on the Mustang GT, but it allows a 125-lb reduction in unsprung suspension weight. And wait heres an added bonus you should have bothered to look up the differences between 1999 IRS to 2003 and 2004 Cobras since thats the year of Cobras we are talking about.
2003 Ford SVT Mustang Cobra review
one of the biggest differences between a regular Mustang and an SVT version lies in the suspension. In place of the venerable solid axle found in the rear of regular Mustangs lies an independent rear suspension (IRS) system. Even though the 2001 model was the first SVT Mustang with IRS, much has changed for 2003. Upgrades include revised bushings and stiffer spring rates for the coupe. A new tubular cross-brace has been added which stabilizes the differential under hard acceleration. At all four corners, gas-charged Bilstein dampers work to keep the suspension under control while providing a ride that's like Goldilocks' porridge—not to firm and not to soft. It's just right. The rack-and-pinion steering system gets a new, low-lash intermediate shaft and higher rate steering gear bushing for 2003. These changes noticeably improve steering feel by helping to reduce play in the system. Additional upgrades include tubular anti-roll bars that are thicker than stock, 26mm rear and 29mm front.
Everything above = 148lbs google things before you make your self look like you dont know what your talking about.
