The Ultra Copper works great those parts. i have put together lots of stock down pipe set ups with ulta copper on the stock doughnut and elbow to turbo for an extra insurance. I use it on my th dp to turbo, turbo to header and cross over. Great stuff.
So In My opinion Go for it
hi temp red RTV works well. I use it on both the header flanges and turbo inlets. whatever you do, DO NOT use it on the oil drain flange. It will break loose and clog the turbo.
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