So on another thread under the exhaust forum, Motordyne explains why the Y pipe primaries are so small. In N/A applications, having smaller inlets closer to the engine help with scavenging leading to better gains than a 2.25 or 2.5 inch. I learned something new today but it explains the reason for the smaller inlets.
JIC Ti - 80mm OK for N/A? - MY350Z.COM Forums
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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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