$70 shipped for this polini clone exhaust. I had it on my stock hobbit for 5km; it made it go 5-10 km/h faster but did hurt my acceleration. I would imagine this exhaust to perform much better on a kitted hobbit.
Also, it's a quite a bit louder than a stock exhaust... make sure people hear you coming!
There is a chip on the header however when bolted to the ped with a new gasket it doesn't leak.