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Oh... That's not what I was expecting at all!!! Are you 100% certain it's MEANT to come off? You may have to make a tool to fit it perfectly. Then stick it in a vice, heat up the nut so it glows then douse the exhaust (not the nut) with cold water and give it some taps while leaning on your tool... I was thinking about a nut splitter, but that's not suitable for those at all, and being chromed isn't going to help at all. Looking at this diagram: Yamaha RXS100 1983 EXHAUST supplied next day (UK only) by Fowlers Parts It appears there's a gasket under that too! Can you get the muffler out of the can? You'll need to do this if you're going to get it chromed. You'll also need to know what state it's in. And since it doesn't look like you can get one of those anymore, you may have to get one manufactured if it's not good... Yambits have one (probably have the gasket too)... Yambits : for Yamaha bikes

There's no substitute for a good thick chrome coat... It's not going to be cheap, but it will be a lot cheaper than getting a good one! As for the nut, you may have to consider it a sacrificial part and split it. You got a picture of it?