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I went with the IRS. I don't see it as any more of a maintenance issue than the 3 link. I was also able to get the deep dish wheel look without any major modifications by just using the pin drive length control arm option.
I'm only pushing about 330HP out of the engine and haven't had any indication of overstressing the rear.
If you would like to know more then just email me on the side.
ben
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