Trackslag Mk7 GTI Downpipe Flow Test

Trackslag Downpipe Flow Test


Flow testing a sampling of Mk7 GTI compatible downpipes continues with the Trackslag catted downpipe.

CTS (Top) ARM (Middle) Trackslag (Bottom)

Test procedure:

The flowbench is first operated with a calibration plate to ensure the measurements are accurate.

The downpipe is attached to the flowbench using a straight silicone coupler and an adapter with an expanding outlet. At the inlet of the downpipe a bellmouth is attached (not shown) to smooth the air entry into the downpipe.

Trackslag Flow Testing

The flow bench is operated at a test depression of 16″ of H2O and air is drawn in through the downpipe inlet.

Test results:

The Trackslag Mk7 downpipe with catalytic converter flows 429 CFM @ 16″ of H2O.

The chart compares this result with other downpipes that have been flow tested:

Trackslag Flow Test Results
Trackslag Flow Test Results Comparison


The Trackslag downpipe flows 429 CFM @ 16″ of H2O which is approximately 150% more than the stock Mk7 GTI downpipe under the conditions described for this test.

The Trackslag is equipped with a large (as seen in the top picture) 200 cell catalytic converter. This catalytic converter is likely to contribute largely to the flow performance.


Trackslag FWD MQB Product page

3 thoughts on “Trackslag Downpipe Flow Test”

  1. What did you think of the quality of the trackslag? Curious on flow of the catless version as well. Thanks for doing what you do!

    1. It looks good to me. By no means am I an authority on welding or downpipe construction though.
      I doubt the catless version would flow much differently than the CTS downpipe that I flow tested without the cat.

      1. Thank you for the reply. I apologize I overlooked that write-up on your site. It appears a nice increase compared to catted. Thanks

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