
To begin with, so far the most comprehensive data available is from MotoIQ's test of Vektor's 991.2 headers. As already stated, that MotoIQ piece read like a sales pitch. Do we consider it independent? No. That does not mean we discount it though.
ByDesign is claiming a 30+ whp gain with Kline's ceramic coated headers on top of a Cobb OTS software tune:

BoostAddict does not sell Kline headers though and the way ByDesign presented this data as independent is flawed. Where is the Mustang dyno data showing all the figures? Where are the min, max, and average data points? MotoIq showed those figures for Vektor's headers and then some:

The graph from The Shop in CT is incomplete:

What exactly are we supposed to gather from that? Ok, at least a graph with numbers for the vertical axis so we can get a better idea of what is going on:

Clearly you see the horsepower curve is right at 455 to the wheels. Why is it the owner posted 461 but without a baseline?

You clearly see a 461 peak there but no baseline figures. He then posted a graph that that looks like it might be touching 461 but again with no baseline curve to compare against which makes it useless except for stating his peak output now:

What do we learn from this? Not much. It's amateur hour testing and practically worthless. Comparing two sets of headers on different cars with different tunes is an exercise in futility anyway but the way the Kline data was presented by @PTS-BRG and By Design quite simply, sucks.
Fortunately BoostAddict member @spdracerut took it upon himself to do a little comparison work:

The power gain % graph is interesting. However, not in the way you might think. The Cobb Tune appears to be pulling timing which results in a dip past 6200 rpm. Why? The ECU may be protecting things and the OTS tune is not aggressive or dialed in for the setup as a custom dyno tune would be.
Regardless, essentially, what we learn is someone who sells Kline headers and someone who got Kline headers (at a discount) are claiming peak gains that are not substantiated by the data presented.
Either show us all the runs, provide the runfiles, or don't bother.
As you can see this is a bit of a mess and BoostAddict.com will be doing testing of the three main header options for the 991.2 3.0 platform on the same PorscheBoost 991.2 project car and on the same dyno.
BoostAddict tentatively came to terms with Vektor who offered a ceramic coated set to test at a slight discount although this is still a large out of pocket expense. That does mean all three designs from Kline, Fabspeed, and Vektor will be in our possession for the comparison however.
Oh, and one last thing which is important to note. The 461 Mustang figure with ceramic coated Kliine headers and a full exhaust with the Cobb OTS Stage 1 tune is 79 rear wheel horsepower short of the PorscheBoost Project 991.2 with Gintani tuning on the factory headers. In case you wanted to get an idea of how much stronger the BoostAddict Tial Sport turbocharger offering is than the X51/GTS turbos tuned by Cobb.
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