Keep up the good work John.
These units have the look - and if backed up with back to back dyno numbers, then no-one can argue. Not everyone has access to the kit required to fabicate these type of units.
My only concern would be the cost of these unit verses the Greddy unit. However you can't really compare the two flow wise. As the UAS one uses the factory runners which distribute flow evenly until all port flow reach the plenum chamber. This to me, signifies a more even distribution of air to the head.
The Greddy unit on the other hand takes the flow and pushes it accross all ports - hopefully even distibution would occur , but who knows ?
The Greddy unit is cast and is VERY rough on the inside - I don't think this helps flow.
N/A style trumpets on forced induction engines are a bit mysterious - Some people swear by them and others say it is a waste of time. I spent time with one fabricator who claimed big increases du to internal trumpets. He also wanted $3000+ for his custom plenum. I said " show me the % perfomance increase versus the % increase in cost over the Greddy, and if your % increas per dollar is more than the Greddy, I will buy it" - I never heard back from him.
Plenum design is THE MOST controversial issue with Forced induction motors. Pretty much all other aspects of performance mods are easy to quantify. Eg:
550cc / min injectors flow more than 340 cc / min ones
Bigger intercooler lowers inlet temps
Bigger turbos flow more air
Adjustable ECUs are able to more accurately adjust air fuel ratios
Increased cylinder capacity benefits everything
Electonic boost controllers adjust boost more accuratley
Free-er flowing heads are able to increase head air flow
and so on
But Plenums - meh - who knows.
I still don't get how SK can say that the std plenum top doesn't flow more air to the middle two cylinders - you just gotta look at it to see why.....
But hell - I am no engineer and no driver , hence why i have turned to Turbo diesel 4WD power.
Bet my truck would beart any of your Skyline accross the Simpson Desert.
Each to their own.
Cheers & have a grouse day