Hi all. I have a thundercat with a aftermarket can but the headers are completely rusted.can u get any performance upgrades by just changing the headers and keeping the same can or will it be the same?

Not sure if the downpipes affect performance but i have just replaced the original downpipes with stainless steel pipes from Delkevic. Only £99 from ebay but also available on Delkevic's website. www.delkevic.co.uk. I was a little jubious of cheap pipes especailly as quotes from dealers were £250 plus. I fitted them myself with no motorbike mechanical experience and they were a perfect fit. No problems and well recommended!!