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Changing the stock X-Pipe to the Fabspeed setup with high flow cats results in dramatically healthier tone. Deeper. Louder. Less muffled. All with stock mufflers.
I then added the Eisenmannm Sport and it hits in you in the chest with tone.
It is crazy talk to think swapping stock X for this upgrade lessens rumble.
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1987 Buick Grand National, 2009 BMW E90 M3, 2016 Audi S6, 2018 MB E63S AMG, currently in 2021 M5 Competition
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