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Originally Posted by SinCityChevelle
That IRS is pretty cool. Man, I change my mind enough as it is. If I had an F Body I don't think I would know what to do with all of the choices. 
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It looks good, but you're spending WAY too much money for what you get; a carrier bracket and toe rods/mounts for $1800... you still have to buy your own takeoff C4 rear suspension, which isn't that ideal of a IRS setup in the first place (ever see what happens when the halfshafts break?) Also, you're putting that C4 IRS into a car that weighs >500 lbs heavier than the original application, so you're putting more than the design load onto the components.
The semi-bolt on (some welding) idea is cool, but it's way overpriced IMO and for that price you should be installing something better than a C4 setup. Also, they altered the toe rods on the outer carrier blocks-- was any math done on those new toe rods to see how they affected geometry, or was the only consideration "bend 'em till they fit without cutting the car?"
It does look good though.
I have a lot of ideas and plans sitting around to re-do my suspension (homebuilt 3-link out back, 3-4" longer LCA/UCA combo up front, etc) but before I build anything I'm going to pick up another frame and box/stiffen it; by that time there may be bolt-ons out there that do what I want. If not, I'll still build my own.
Troy