I've seen '03-'04 Cobras run mid 9's with IRS... it'll take a little more power (turbo), but it can be done. There are groups that shun on guys who put live axles in their cobras.... kinda funny, but it takes a little practice... a bushing kit really helps as well. Check out svtperformance.com's tech threads. I'm sure you can dig up some info there...