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    • The big Porsche 911 header/manifold test on a turbo upgraded Porsche 991.2 Carrera 9A2B6 3.0 - Kline vs. Vektor vs. Fabspeed

      The PorscheBoost Porsche Performance Forums were able to acquire the three major designs of aftermarket 991.2 9A2B6 3.0 turbo headers. From top to bottom what you see are Fabspeed, Vektor Performance, and Kline.


      These will be tested on the PorscheBoost Project 991.2 which is currently running the BoostAddict Stage 1 package comprised of Tial M660 turbochargers, Fabspeed bypass pipes, IPD Plenum, and Gintani tuning for water-meth injection on 91 octane.

      The car is currently at 540 whp on a Mustang dyno on stock inlets, stock intercoolers, and stock manifolds.

      A turbo upgraded 991.2 3.0 will be moving much more air than stock so it is an excellent test bed for the aftermarket manifolds. A restriction will be quickly exposed.

      Take a look at the factory manifolds courtesy of Fabspeed:




      Fabspeed believes there is room to improve especially in the top end.

      Let's compare the design elements of the three aftermarket options starting with Kline.

      Kline Pictures:












      Vektor Pictures:






















      Fabspeed Pictures:




















      So which is the best design? Well, it depends. PorscheBoost believes all three will show an improvement over stock and the choice comes down to what you want to pay and your goals.

      Vektor's headers for example are ceramic coated by Swain Tech. This adds quite a bit to the price. Vektor insisted on sending a coated set for testing so this is not apples to apples but if a ceramic coated set offers a noticeable difference over the non-coated headers we certainly will see that.

      Fabspeed is non-equal length and has the shortest runners. It looks like a very simple, efficient, and straightforward design. It also feels very solid in your hands.

      Kline is equal length but at points has some bends that look crimped as if the diameter might not be the same throughout. Like Fabspeed, Kline's material is 304 Stainless Steel.

      This brings us to the major difference in material between Kline, Fabspeed, and Vektor. 321 Stainless Steel in the Vektor manifolds is stabilized with titanium. 304ss is cheaper and not as good at high temperatures as far as longevity is concerned. For a street car application both should likely last a very, very long time though.

      304 Stainless Steel Tubing
      304 stainless steel is an ideal stainless for the construction of performance headers. It is widely used because of its ability to withstand corrosion. Because itís ease of weldability and excellent forming capacities, 304 stainless steel makes an ideal choice.

      321 Stainless Steel
      Considered the preferred material for high temp applications such as turbo headers, 321 stainless steel offer extreme resistance to high operating temperatures. Used extensively for turbo applications, 321 stainless steel can operate at above 1650 degrees without sacrificing its structural integrity.
      Now, if the material is a concern to you or you intend to track in desert conditions meaning long WOT periods in hot weather you may want to go to Inconel which Kline offers their headers in. Of course, this means a price increase for the material.

      The inconel manifolds also weigh less:

      Quote Originally Posted by Kline
      Materials
      Available in premium grade Inconel 625 superalloy

      Available in 304 grade stainless steel

      Manifolds (Inconel 625), 1.5kg each.
      As buying three sets of headers and then testing them is already a major expense it is obvious why we went with 304ss for the Kline headers.

      Vektor also appears to have the largest radius bends and runners merging around a central point rather than a flat merge. The Vektor headers also certainly are physically the largest and heaviest.

      Pricing:

      Fabspeed: $2295.00
      Vektor: $3250.00 + $325 coating = $3575.00
      Kline $2350.00

      I will say Fabspeed and Kline jumped at the chance for this comparison. No, the headers were not free but Kline did discount a bit for the test. Kline had headers to me first and it literally took a few days. How Kline shipped so fast from overseas I have no idea.

      Fabspeed was glad to participate and had a set to me quickly once they did a production run.

      Vektor took the longest and did not communicate as well as the other two. Vektor did not seem eager to participate and did not feel they needed to prove anything. PorscheBoost.com feels as Vektor being the newest of the group in the Porsche market actually has the most to prove. Vektor's coated headers were the most expensive by far.

      As stated, all three will be dyno tested on the PorscheBoost.com Project 991.2. After which 60-130 testing will commence with one chosen option. This same option will also be tested at the drag strip.

      Ideally, we would test all three sets on the dragstrip as well but it is not feasible to rent the drag strip for a separate header test each time. BoostAddict.com rented the Famoso drag strip for May 5th and anyone is free to see how the car performs in person.

      Dyno results should come within the week.

      As I will not be able to obviously run all three designs, if you would like one of the sets left over at a discount after testing is done feel free to PM.

      #project991

      This article was originally published in forum thread: The big Porsche 911 header/manifold test on a turbo upgraded Porsche 991.2 Carrera 9A2B6 3.0 - Kline vs. Vektor v. Fabspeed started by Sticky View original post
      Comments 31 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by spdracerut Click here to enlarge
        They're in Van Nuys, CA right? Looking at the weather, hopefully only a 5 degree range during testing of all the headers.
        They are. It's fairly involved so we'll see but I really doubt a few degrees here or there will skew testing. The weather is going to be consistent until next week.
      1. spdracerut's Avatar
        spdracerut -
        How goes testing?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by spdracerut Click here to enlarge
        How goes testing?
        Gintani is focused on the software side for now and getting some incredible gains. Remarkable stuff really.
      1. quattr0's Avatar
        quattr0 -
        Which one is this? Vektor?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Which one is this? Vektor?
        Heh I don't think you read. I'm testing all of them.
      1. quattr0's Avatar
        quattr0 -
        So ALL shows gain eh? Interesting.
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        So ALL shows gain eh? Interesting.
        Maybe. We haven’t gotten to headers yet. We’re gaining on the software side. At just short of GT2 RS output on stock headers, stock inlets, and stock intercoolers.

        The turbos are amazing as is Gintani’s tuning.
      1. spdracerut's Avatar
        spdracerut -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        So ALL shows gain eh? Interesting.
        They've all shown gains on various cars. The only question that remains to be answered with 100% complete certainty is which ones show the most gains. Of course, aside from power/driveability gains, there's material selection which plays into durability.
      1. spdracerut's Avatar
        spdracerut -
        How goes testing?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by spdracerut Click here to enlarge
        How goes testing?
        They haven't gotten to the headers yet. Pretty busy shop right now.
      1. Xiao's Avatar
        Xiao -
        Keep it up!