I think it is 10lbs +/- even though some people have claimed it to be much more.

 

[QUOTE=13V6coupe;8517091]Insurance against anything like that video happening to my car....

It may require a tic less gas and maybe even allow a tic quicker clutch release from stoplights? But I only put it in for insurance reasons against the oe having some catastrophic failure.
Been to RA and BIR with it a couple times and repeatedly exceed 140 at both, so wanted to make sure no driveshaft failures occurred even though there are numerous reports of people on the stock driveshaft surpassing those speeds
Nice, I take it it, that it also got rid of all that clunking undderneath

 

I just installed the DSS 1 piece and the vibration in the steering wheel is much better. $60.00 install. Much lighter too. Also new Bassani exhaust dropped 50 lbs.