We wanted to chime in on this since you guys have some concerns regarding the roughness and methods used to produce these plenums. We have put in a ton of hard work and dyno time testing many different configurations to find the best performing modification.
We have been doing this work locally for over a year we recently decided to make it a service available globally. Before we decided to do this we tested 8 different configurations with back to back testing on the dyno to refine the port work we do. Targeting the most consistent, and maximum gains based around our 400HP package.
For our dyno testing reference it is worth noting that when we perform these test back to back but we put a couple pulls in between the runs we show, because the car cools off when we swap the parts and it has to get back up to temp to make the same similar/equivalent power.
We have tested smooth and rough finishes on the same ported out plenum to see if any gains were to be had and no measurable distinction could be found however the difference in labor time was extensive, a smooth finish with no power to be had would come at a much higher cost. We already spend 3 hours per plenum removing extensive material from targeted locations and then work to refine the finish.
From a plenum to plenum standpoint we have found that there is quite some range in the accuracy of assembly. Having worked with many of these parts now it is not uncommon to see some where the two halves are put together accurately and the runner unions are reasonably smooth with not much overhang or "lip", while other plenums will have a distinctive shift or twist where they are assembled. So each plenum is worked by hand as needed some need only moderate matching and porting while others need quite a bit more labor. In the end they make great power and we are offering with an exchange service to keep the down time to a minimum.
Tuning cars with the mod has become weekly occurrence for us here and the P mod has never let us down.
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