I got a full FMF system on my bike at the moment, if I change the end can to say a nice "ART" one and get a connecting pipe made up will I need to mess about with tuning?? Will I be able to bolt it right on (obviously sort the connecting pipe)?? If I'm going to run into running problems with the single then I'll just leave it as it is. Its just the FMF end can is looking a little tired wanna get a nice used one of ebay maybe and replace the end can. Anyone got any hints or tips??