Thinkin about running stainless true duals on my x. Just windered if anyone has done it? what pipe size? power results?

Yeah I've done it. It sounds really good too! I ran 2" all the way from the stock header flage without cats, to a S.S.Dynoflow muffler on each side. I welded in new O2 sensor bungs just after the flange. I did not need to worry about smog laws since this is a offroad only X. Mellow and quiet for the most part, but nail the gas and she lets out a loud deep tone that can be heard for quite some distance.