It's been said over and over that IRS cars typically only show a benefit over solid axles on bumpy surfaces, and ride quality is noticable on the street. IRS also allows you to adjust camber and toe, both of which are great things to have. But if you know what you are doing, you can do that on a solid axle as well. IRS setups typically wont have pad knockback issues either.
But, our cars just aren't packaged for IRS systems. If you want to chop the rear tin, go for it. Be prepared to run flat-faced wheels and narrow the IRS enough for the correct hub track.
If you want a all-out race car like Tyler, then I think IRS is worth considering. If it's a track day car, I wouldn't bother. But that's just my opinion.
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Matt Jones
Mechanical Engineer
Art Morrison Enterprises
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