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i just removed the butterflies on mine, and i felt alot of extra power above 6600 rpm, whihc is high int he power band, but it was pretty cool actually. it owuld like kick in.
also
the 4 port head flows better, but the jdm ecu is tuned better i beleive. also the rev limiter on dtm edm whatever is 7200? where jdm is 7700
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