i still run a pretty much stock irs rear end on my 1303 race car. 944 torsion bars and spring plates along with steel arms [not flipped] none adjustable kyb shocks and a 944 anti roll bar.
theres enough adjustment in it to set it up and when i was running 9x15 rear rims with 240/540/15 slicks i had even tyre temps across the tyre. Its even better now i have gone to a narrow tyre and rim [7.5x17 with a 210/640/17 tyre] as i can get more heat into the tyre quicker.
the stock system works and works well plus its pretty light and easy to replace should you bend somthing.
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