We have concrete evidence of how they worked on a 370 with stock intakes and without stock intakes earlier on in this thread which i have mentioned already. The car we dyno'd was johns 2012 370z the first run is with an invidia catback and stock intakes, the second is with the invidia catback and our intakes which made 20whp over run number 1. If anybody has any questions i will be happy to post up the dyno sheet again to satisfy everyones concerns
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