I have one. Its OK. Not sure I got it clean enough the last time I cleaned it so it doesn't seem to flow like it should.
Bottom line: If I was to do it again I'm unsure if I would get the same thing but don't have a good reason I can put my finger on. I'd more likely go with either a BHAF or a AFE.
On the other hand, thge turbo on my 97 spools up a LOT faster then my daughter's 96 CTD. I have a 4in exhaust, stock turbo and ATS exhaust manifold with the Green filter. My daughter has a stock exhaust, stock turbo, stock exhaust manifold and AFE filter. Otherwise the trucks are pretty much the same.