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    • The big Porsche 991.2 3.0 header test Part 2 - Manifold flow rate and manifold weight of Mimo/SPW vs. Kline vs. Vektor Performance vs. Stock

      Well, here it finally is! Apologies to our readers for taking so long but setting up such a test is not easy. The blessing in disguise is that a new option made the comparison and that option is made out of inconel and it is an engineering collaboration between Mimo Technik and SPW (Specialty Precision Welding).


      As you previously saw BoostAddict.com purchased the three most popular header options on the market for the 2017-2019 Porsche 991.2 3.0 Carrera models. You can make it four now.

      The idea was to compare the headers on the dyno but a flow bench was utilized instead. Why? Because the gains will vary on the dyno based on what modifications a car has as well as weather and cooldown time. A car like mine with upgraded turbos, methanol, inlets, intercoolers, etc., is going to move much more air than one with a tune running headers.

      Here we have repeatable, consistent results minimizing variables showing what the manifolds can flow.

      Fabspeed headers were not included in the test. Why? Because they are currently on the PorscheBoost 991.2 Project Car as Gintani felt they were the design they wanted to tune around. So you will get dyno numbers too but just for the Fabspeed option showing a before and after.

      Here are some important aspects to note:

      1. All headers show a large improvement over stock. This is why Porsche changed the manifold design on the 992 from the 991.2.
      2. Kline also makes an inconel header so if you want their lighter option, you can buy it.
      3. The competitors are not named.
      4. All headers purchased for this test are available for sale and basically brand new. PM @Sticky or e-mail admin@boostaddict.com to purchase at a discount. Why waste money?

      Flow numbers:




      Manifold weight:


      What we will say is Brand A offers the best combination of value, weight, and performance. The stock design truly is heavy and inefficient. Everyone tremendously improved on it and if you are tuning your car but still relying on the factory header design, why?

      The Mimo Technik and SPW header collaboration is the lightest and best performing. Yes, it is the most expensive but it is cheaper than Kline's inconel option. It is the choice for the guy who absolutely wants the best as well as track junkies.

      PM the @Sticky account if interested to purchase.

      Mimo/SPW:




      Kline:




      Vektor:




      This article was originally published in forum thread: The big Porsche 991.2 3.0 header test Part 2 - Manifold flow rate and manifold weight of Mimo/SPW vs. Kline vs. Vektor Performance vs. Stock started by Sticky View original post
      Comments 70 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        You really think that? I have no pull at Moto IQ. Obviously you can go on their website and see who advertises through them. We do not so I don't see how you can make the assumption that we controlled the review. Results are whet they are, and from our own extensive testing we knew the headers performed well. What they do an awesome job at is documenting the install, which is where we fall short typically.
        Now I see it's 'we' so you are involved with Vektor. Great, maybe we can get every employee in this thread?

        You absolutely controlled the review as I was told Vektor preferred going that route for that reason. Regardless, anyone can read it and see it reads as an advertisement and certainly is not a performance comparison with other header options.

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        I'm not asking for anything except for what you said you were going to do.
        I never spoke to you once or promised you anything. I do not recall any agreement whatsoever with you.

        I am free to spend my money and test how I please.

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        I am the sole engineer and designer behind the Vektor headers. Pressurized manifolds (turbo manifolds) is something I've been doing for many many years.
        Good for you.

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        A bench flow test does not determine a header's performance. It is one aspect that can be shadowed by several others. Stating Mimo maximum flow bench testing is the highest is a true statement. Saying that test is reflective of real world performance (that is based on heat, sound, surface area/volume, flow, scavenging, reversion, pulse timing, etc., etc...) is just ignorant of the variables that influence how IC exhaust gases interact with a manifold's design and power (energy) capabilities. Manifold design can have a profound effect on an engine's VE.
        I didn't say a bench flow test determines a headers performance. I said the Mimo set performed the best in this test. What are you guys struggling with understanding there?

        Where did I say this test reflected real world performance? This test reflects the flow rate on the bench and I'm sorry your set didn't flow the best. It certainly improved on stock so what is the problem? We have clear data points from multiple aftermarket headers showing a major improvement over stock.

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        No, I covered the cost of coating, and wanted to have it done for a few reasons. One, it highlights the option, which not many other manufacturer's offer. And two, most of our customers buy them coated so there is obviously interest in the coating. Lastly, it's a great product that we use in many applications and will continue to use until a better product becomes available.
        I could have paid less without coating. I agreed to coating due your request. Why would I do that unless I wanted to showcase the product in the best possible light?

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        There is no test out there from an independent source showing otherwise; this test was supposed to be that according to you. Not very professional.
        This independent test shows the Mimo set flowing the best. It is what it is.

        You can buy a set and do whatever 'profesional' testing you want to.

        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        I'm sure there are others that would like an opportunity to snatch up some performance headers at a discount. We do not have 'sales' here.
        Well I certainly hope so. The sooner these are gone the sooner I can get the best engineered option on the market on my car.
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You didn't read the thread and flow charts absolutely mean something.
        I did, I just assumed all the testing would be done on your car personally since you have all the manifolds.

        Manifold swap is simple and quick on my TTS, can't imagine it being too different on your car.

        A better test IMO, would be back pressure between them. The bottle neck is the turbo, so no matter how much the header can flow that will be your weakest link.
      1. VektorPerformance's Avatar
        VektorPerformance -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I never spoke to you once or promised you anything. I do not recall any agreement whatsoever with you.
        How about you allow my login to add pictures (links to pics) so I can post all the screen shots of the conversation?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Payam@BMS Click here to enlarge
        I did, I just assumed all the testing would be done on your car personally since you have all the manifolds.
        There will be testing on the car as well so I don't see the problem. I just won't be able to test every set.

        We have other priorities right now.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by VektorPerformance Click here to enlarge
        How about you allow my login to add pictures (links to pics) so I can post all the screen shots of the conversation?
        I can post the screenshots.

        What does this have to do with anything? Did I sign some NDA with you or something? I bought a product. I can do whatever I want with that product. It belongs to me.

        I can test it however I see fit. There were no conditions for the purchase.

        The last message I think I got from you was asking for free advertising, wasn't it?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by VektorPerformance Click here to enlarge
        How about you allow my login to add pictures (links to pics) so I can post all the screen shots of the conversation?
        This is all I said which you already posted:

        Well that's fine but my job is to test and report aftermarket products and independent tests are the strongest. I plan to do 60-130 testing along with the dyno. The only set I'm missing is Vektor.
        I still plan to do that just not with every set. Plans change. I never said 'I promise' or 'I will' nor did we ever set anything up so I don't see the complaints. I owe you nothing.

        If you don't like the test that was done, fine. Don't like it.
      1. Payam@BMS's Avatar
        Payam@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        There will be testing on the car as well so I don't see the problem. I just won't be able to test every set.

        We have other priorities right now.
        I understand, no worries. Hopefully you get the car back soon :/
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Legba6 Click here to enlarge
        There is no test out there from an independent source showing otherwise; this test was supposed to be that according to you. Not very professional.
        Here we are:

        Click here to enlarge Originally Posted by Vektor Performance Click here to enlarge
        If you buy a product, it's yours to do with as you please; run, test, race, sell, etc.
        Case closed.
      1. VektorPerformance's Avatar
        VektorPerformance -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I never said 'I promise' or 'I will' nor did we ever set anything up so I don't see the complaints. I owe you nothing.
        You laid out plans in more than once instance, and gave no reason for me to think otherwise.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by VektorPerformance Click here to enlarge
        You laid out plans in more than once instance, and gave no reason for me to think otherwise.
        I don't owe you any explanation. You already understood how this works before I ever bought the set:

        Click here to enlarge Originally Posted by Vektor Performance Click here to enlarge
        If you buy a product, it's yours to do with as you please; run, test, race, sell, etc.
        Suddenly, what, I'm not free to do with the product or my money as I please? Hypocrisy?

        The test is over. The data is published. There is nothing more I can do for you. It is time to move on.