Originally Posted by scottydsntknow
Well if you have a vert like in your avatar you should be aware that the front and rear bumpers of all Mustang convertibles were twins separated at birth and forever trying to get back together. Full length subframes and strut tower brace are required items for a vert. Also battle boxes and get rid of the junk 4 link rear suspension setup for a torque arm/panhard bar setup or an IRS from a Cobra.
I agree, even reguardless of vert/hatch/coupe the chasis stiffness of the fox body stang is a issue to be aproached with the utmost care. Battle boxes are a REQUIREMENT at 275+ RWHP. Past that full length subframes are also important to helping the cars chasis system. Furthermore a roll cage/bar WELDED to the full length sub frames will greatly improve your cars chasis system and ensure that your unibody stay straight and does not flex allowing for future issues with your cars straightness. The sooner you give your mustang the reinforcement of a cage/bar welded to subframes the better the chance you have of keeping the body straight, even if you have no mods. This is true as even stock fox body stangs have trouble keeping their bodies straight. As far as using IRS suspension, it is a mistake. The only reason the Terminator cars use IRS is to help balance the weight of the forged iron 4.6 power plant that weighs as much as a 460. The terminator to IRS swap to solid axle rear end is a .2 sec ET improvment (in stock form) over the IRS system, so you know IRS is a mistake from the get go. A panhard bar is more suited towards road racing, what keeps your car straight in the 1/4 with slicks/radial tires is using wishbone bracing as UPR offers.