Lower Plenum- Mrev2Installation difficulty - Easy to MediumInstall time - 3 hours max took me 20 mins because i already installed my spacers beforeCost - approx. $450ish nowAdvantages - More HP and torqu, great sound, great kick in the seat, "Maybe better gas mileage depending on how you drive)Disadvantages - Louder Sound(for some), and pricey

After I installed the MREV2 lower intake and plenum spacer I noticed a raspy rattling sound coming from the engine bay during certain RPM ranges. Anyone know what this is?