AFE Silver Bullet Throttle Body Spacer 2020-2022 Nissan Frontier V6 (3.8L)Serrated Helix Design: The Serrated Helix combination design creates intake turbulence in the combustion chamber. This turbulence breaks up the fuel which creates a more complete combustion cycle increasing horsepower, torque and improving throttle response. The Serrated Helix combination design also reduces intake whistle that occurs with Helix only designs (US PAT 07055513). 6061 T6 Billet Aluminum Construction: All Silver Bullet Throttle Body