I called up MagnumForce racing for you. They told me that there is a negligible weight savings with just using the upper control arm replacements only. However, if you do the all out replacement tubular K member with coil overand rack and pinion steering. ...There is a significant weight reduction in the front end. BTW, they will be soon offering I hear, an IRS rear set up for the E bodies also.
Go to: magnumforceracing.com