426 exhaust on WR400

I have access to a 426 exhaust for sale- is there any power or weight advantage? What's the going price? I did a search with no good results in the archives. Thanks.

Most people say that the stock yz exhaust is the best all around exhaust, the only problem is that there is no spark arrestor and it's a little loud.

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'99 WR400

'92 GSXR 7/11

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I don't mind loud and no spark arrestor, I ride on a track. I'm mostly concerned with weight loss, how much a 426 pipe is worth, HP increase, and if the headpipes are the same or different from a '00 WR400.

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