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Message: <blockquote data-quote="skylee834" data-source="post: 3721889" data-attributes="member: 60392">if u place 4G93 cam into your 91 head,actually not much different like last time i do...then u will find out u need the full set completed head for better result..then u will find the REV cut too early due 4G91 cut around 6.5k,but still feel that u can gain some more..then change 4G93 ECU,now REV can go to 8.5k...u will find 4G91 cam power show up early and end early..but the 4G93 cam can give u more power around 6k RPM...now i using GSR intake,but really,if u maintain 4G91 head,better stay with your original intake...if u choose 4G93 head,the best intake is the GSR intake for better quick response..just my opinion....<img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/biggrin.gif"  class="smilie" loading="lazy" alt=":biggrin:" title="Biggrin    :biggrin:" data-shortname=":biggrin:" /></blockquote>

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