MOTORDYNE ISO THERMAL 5/16 INCH PLENUM SPACER & INTAKE MANIFOLD LOWER COLLECTOR Infiniti FX35 M35 VQ35 G35 Nissan 350Z MOTORDYNE ISO THERMAL 5/16 INCH PLENUM SPACER & Lower collector manifold This stealth modification adds 11HP-14HP and is the simplest to install. The 5/16" plenum spacer outperforms the competition and is fully compatible with all stock and aftermarket strut bars. This kit includes the iso-thermal gasket. Adding this Lower collector manifold to the non rev up VQ35DE engines will result in a steady increase of linear power from low-to-high range rpm. Power increase can be seen from the 4-8 hp marks depending on other mods. MOTORDYNE ISO THERMAL 5/16 INCH PLENUM SPACER - INFINITI M35 FX35 G35 - NISSAN 350Z All Motordyne products are engineered through tremendous R&D procedures by true aerospace engineers with many decades of experience in building aircraft and satellites! Truly the BEST engineering you can get for your street car!