From the looks of these dynos (and why the hell are the graphs so small? Seriously, what's the point of providing graphs people can't even read?) the gains all come in the mid-range with the plenum and Y-Pipe.
Let's look at the plenum alone:
There is a jump of 55 lb-ft of torque at 4300 rpm which fades quickly. You see an increase for a few hundred RPM. Now, that's good if true but hardly broad.
Now look at the plenum with the Y-pipe:
70 lb-ft of torque at all four wheels over stock at 4300 rpm. You see gains basically from 3800-5200. The Y-pipe does provide a slightly better curve but it's really just that mid-section where the majority of the gains come from.
Is it a Porsche intake defect? What is the explanation here?
We definitely want to see independent testing that verifies these claims. Not to mention, graphs that are readable.
IPD took delivery of its 991.2 Turbo S and the R & D started the second it arrived at its new home. The new Turbo doesnít substantially benefit from any one particular upgrade, but the sum of its improvements deliver a superior overall Turbo compared to the already impressive 991.1 Turbo it replaces. Yes, we know the latest Turbo is faster with 20 more horsepower but itís the combination of lightening shifts, razor sharp handling and spiritual connection to the vehicle that elevates the driving experience of the extraordinary new 991.2 Turbo.
Porsche made a number of substantial upgrades with the latest 991.2 Turbo. Engine improvements include revised intake ports, larger injectors, higher volume fuel pump, larger turbo compressor wheels and more efficient intercoolers, but the factory intake system remained relatively unchanged allowing the IPD Plenum and Y-Pipe to fit with only minor modifications.
The 991.2 Turbo Plenum upgrade delivers staggering engine power and torque gains that will raise the performance bar of the already potent supercar as well as the hairs on your neck. Horsepower gains are found throughout the entire power band with the bulk of the gains being realized between the 3500-5000 RPM range. Max power gains of 45+ wheel HP come in at 4300 RPM and hold strong all the way to redline. Torque is even more impressive at 60+ in the midrange with a massive torque gains from 3500-5000 RPM.