I don't have separate dyno for just upper and just lower but i have one for both. I saw gains of about 20whp mid range and about 10whp at peak. This was with a retune also.
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RHM 75mm TB & ported up/low mani., 3" intakes, Z1 Headers, Motordyne ART pipes, Henko Autolab 3" y pipe & exhaust, Tein MonoSport, SPL F/R arms, endlinks, and tie rods , Eibach sways, Z1 rotors F/R, diff bush., subframe collar, FDF diff brace
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