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Not to rain in on this handling thread, but being the owner of BDR with plans in putting a 600 plus motor in, I too was concerned about the rear IRS. With the mentioned $3000 upgrade of the M type suspension, then you have to upgrade to 17 inch wheels, just to handle the horsepower feasible. There is another option that can be takened. The differential is the same for the base and the upgraded M suspension. I have located a company that will build custom 'BOLT IN AXLES' and gaurantee them to 750 rear wheel horsepower for one year. This way you get to keep the base suspension and the 15 inch wheels and knowing that your IRS will handle extreme horsepower without adding the full $3000 upgrades. Though they are not cheap, it will cost you roughly half of the $3000 plus upgrade. Easy bolt on that will add some peace of mind.
DON
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