Got a k-tec stainless (essentially the old supersprint) on mine - love it to bits... sounds great, definate increase in power. As Wobba says, getting the joint right between the downpipe and the cat is a bugger - took me many many goes to get it right but again seems OK now. Don't really do the miles for cracking to become an issue (yet!). Oh, and go for the stainless if you can, much better quality.