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I use the slp smooth bellow. A little soap and water to get it on the first time and once its on for a while it is easier to get on and off. Thats over a fast 90 if it matters
I just have a piece of 4" ID silicone tubing on my NW 90mm TBand it fits perfect. I do have a 100mm Lingenfelter MAF on the other side of the tubing, and it fits like a glove.