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Old 04-18-2013, 03:46 PM   #3
Dave D.
NASIOC Supporter
 
Member#: 130990
Join Date: Nov 2006
Chapter/Region: NWIC
Location: Menzel Lake, WA
Vehicle:
06 Red Ltd.Wagon
20g-xtr 430/413 JJtuned

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The same mods on an EJ255 vs. a 257 will yield virtually identical numbers.

The heads have different chambering, and I've heard said the 257 heads might be good for a little more tq. But nothing significant.
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