"anti y pipe" that is a funny way to put it. I do feel that out of the H,X, or Y configuration if they are all equal diameters the Y would be the most restrictive. However it is also a popular configuration used by fujitsobo, powerhouse amuse, and gthaus to name a few. I worked on Mustangs for years as well. Started with a 2000 v6 later onto a 2004 GT I ran short headers, o/r X, and a magnaflow catback, while many here would say it's loud to me it was sublime. I guess when it comes to the Z application its on personal preference.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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