| Just the sizes of the inlets on the bottom sides. On an NA they are for the water drain tubes and a larger diameter than the ones on a TT that feed air back in from the stock recircs. If your going to be using BOV's on a TT conversion then you can just use the NA pipes and cap the holes off just as you have to do on a TT.
Russell Floyd Z1 Motorsports www.300zx.com 1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance 2877 Carrollton Villa Rica Hwy Carrollton, Ga 30116 770-838-7777 770-832-9253 (fax) 
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