warning from a former IRS user... I've had 2 and they're kinda fragile for whoopin on. You'll want a pretty stiff rear spring on your coil overs... otherwise it's just too soft and you get mad wheel hop. Are you running front coil overs? If so, what spring rate?
PM me your email address and I'll put together a quick drawing plus some pics of mine installed. Done properly they're useful with IRS, done wrong they'll make the trunk smaller and that's about it.
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