aFe Silver Bullet Throttle Body Spacer 19-21 Toyota Corolla L4 2.0L - Black Shift Boots You will also note that

You will also note that ARP offers specially undercut studs for several engines

Year Make Model Submodel 1991-1994 Nissan D21 Base 1991-1994 Nissan D21 SE 1994 Nissan D21 XE 1995-1997 Nissan Pickup Base 1995-1997 Nissan Pickup SE 1995-1997 Nissan Pickup XE

Ferrea Subaru EJ20 36mm 5

Brian Crower Honda/Acura B18C/B16A/B17A 34mm Intake Valves

GSC P-D Toyota 2JZ-GTE 23-8N Chrome Polished Exhaust Valve - 29mm Head (STD) - SET 12

aFe Silver Bullet Throttle Body Spacer 19-21 Toyota Corolla L4 2.0L - Black Shift Boots You will also note thatThe serrated helix design creates air turbulence in the intake manifold. This turbulence increases the air pressure in the combustion chamber, resulting in increased performance and improved throttle response. The serrated helix combination design also reduces intake whistle that occurs with helix only designs (US PAT 07055513). This Silver Bullet throttle body spacer is precision machined from 6061 T6 billet aluminum for lightweight, high strength,