Update of my Spanish friend ZC21S Broke the ZC21S gearbox 4th gear on a track day Now running with ZC31S gearbox with LSD etc Refer here for previous post http://zc21s.blogspot.com/2011/07/zc21s-turbo.html
My 65mm throttle body is here finally Fly by cable throttle body for ZC31S intake manifold For those ditching the e-throttle for cable conversion Available in 60mm and 65mm
Below is the 3 kits which i had tried over the past 2 years on my NA setup Here's the summary
HKS Racing Suction Reloaded Kit- A good balance between low - high end. Experienced the worst fuel consumption return with this kit. Could be it constantly feeding in warm air.
Tsuchinoko Intake Chamber + Blitz SUS Power Filter- This kit is good for mid - high end, i'm amazed upon 6k rpm and above. The constant pull and never felt desperate for more air. For fuel consumption it achieved inbetween the HKS Racing Suction Reloaded Kit and the HKS Custom Made Kit.
HKS Custom Made Kit + Cold Air Box- Best low - mid end experienced. Best fuel consumption return was achieved with kit. The Cold Air Box blocked the hot air away from the radiator fan.