Flow testing a sampling of Mk7 GTI compatible downpipes continues with the Trackslag catted downpipe.
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.
The flow bench is operated at a test depression of 16″ of H2O and air is drawn in through the downpipe inlet.
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:
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.