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Instead of asking yourself what size injector would be efficient for X amount of boost.

Decide on your injectors by an estimated amount of Hp your shooting for.

310cc 200-220whp
440cc 220-325whp
550cc 325whp-380whp
660cc 380whp-425whp
750cc 425whp-475whp
880cc 475whp-525whp
1000cc 525whp-600whp
1600cc 600whp-800whp

(#'s compliments of tepid1 from Team-integra).
 

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^^^^ yea pretty much. i bought 780s and am shooting for 425-450whp.

i wouldnt buy anything less than 450cc's. its just easier to get them a lil bigger now than later. with 15psi you should be well into the 300whp range, more likely 350 or so
 
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