I was researching my rearend options in my SA when I ran across this. I don't know if this has ever been mentioned (couldn't find any references to it), nor if it would ever be necessary, except at the outer limits. It looked interesting and the company's name, RCC Specialties, is pretty cool too.
A 9 inch IRS at what looks to be comparatively competitive pricing. Way more than I currently need, but I thought of those that are running huge horsepower and want to keep an IRS for road racing while having the strength and ratio options of the 9 inch.
Here's another link with good pictures showing a unit going into a Cobra kit car. This is for those of you like me that can only drool.