| On 98% of members car's here I'd say they see little to no gain by going from 2.5" to 3".  However when we start talking 600+ rwhp it is going to start making a difference ~10-15 hp.  750+ probably a considerable difference ~25-30 hp.  Start getting near 1000 rwhp and the 2.5" maybe killing ~75+ hp. 
Russell Floyd Z1 Motorsportswww.z1motorsports.com
 1990+ Nissan Z specialists
 Used Parts, New parts, Service/Repair and Performance 1200 Carrollton Hwy Temple, Ga 30179
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