At high engine horsepower levels the stock inlet plenum not only becomes restrictive, but more importantly the air distribution acrosscylinders becomes uneven and results in a variation in air/fuel mixtures from cylinder to cylinder. To solve these issues, APS has developed what is arguably the ultimate inlet plenum for the 350Z in high horsepower naturally aspirated and forced induction applications. In day to day driving conditions, the APS Tall Boy plenum delivers crisp throttle response and higher torque - resulting in an even more enjoyable drive. And the higher the horsepower, the wilder the ride! Cast in light weight alloy and then NC precision machined, the APS plenum pumps-up the internal plenum volume and delivers the optimum distribution of air to each inlet trumpet. For ultra high horsepower (over 600 flywheel horsepower) applications, the APS Tall Boy plenum has provision for an additional 6 auxiliary injectors - one for each intake runner. Combined with the APS Extreme Performance Fuel System, this will satisfy the Z performance enthusiast seeking the ultimate in fuel injection for monster built Z engines. With dead true NC machined mating faces, the APS Tall-Boy is a direct bolt-on replacement of the stock plenum and utilizes the stock gasket. All ancillary hardware for easy installation (in under an hour) is included. Power through precision is a frequently heard motto at APS - and the Tall-Boy plenum is a perfect example. To see more components for the Nissan 360Z Twin Turbo kit click HERE If you would like further information on the APS Intercooled Twin Turbo System for the Nissan 350 Z, please do not hesitate to contact Autotech Engineering via email on on sales@autotechengineering.com.au or by phone on (02)9897 1378