We did a very good job opening these manifolds up and porting them. I don't think they are going to be that much of a limiting factor. Maybe 40 hp difference in a set of tubulars.
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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