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I like my aem rail and reg a lot. Way better throttle and ofcourse the adjustability. Yes for our **** you must get rail and reg. the combo looks great anyway. you'll appreciate the difference. When i did mine i changed both sets of injector o-rings and fuel filter also. If i remember right aem doesn't make a filter for 4th gen. happy install
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H22 still sitting, B17 running strong
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