ARM Motorsports 4.5" Catless Downpipe Flow Test - Stock Exhaust Transition

ARM 4.5 inch DP Flow Test

Background: The ARM 4.5 inch DP for the Mk7 was recently released, and ARM Motorsports contacted me to ask if I would conduct a flow test with the new downpipe. This downpipe is unique in terms of size, which piqued my interest in testing it to see how it compares with some of the other

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