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I have a hx35 on my rb25 currently. and I had a hx30 on my rb20 in the past. imo they are great turbos for the coin. the op is prob comparing the 2 because they both use t3 flanges.
I actually had 650cc injecs on my 30 before I ran 22psi on the regular.
on my 25 I can't get past 12-15 psi without some kind of cut, but the funny thing is my nistune says iam only hitting 45% duty cycle on the stock injectors. so go figure!!
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