I have a progress and it does rub the stock muffler a bit but not hurting anything. I've heard the 24mm has no issues at all through.
As for endlinks you don't have to get new ones but the first problem you're gonna run into is the likely rust on the stock ones preventing you from getting them off easily. If you don't break or strip them in the attempt to get them off you might be ok but if you drive really hard they will prolly break. I used stock endlinks on my progress bar for a few months till one too many spin outs finally snapped them. Its worth the money not to deal with that kinda hassle.
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