I love Turner Motorsports stuff, they seem like a company full of BMW enthusiasts that make great quality stuff without tacking on the M Tax.
One "downside" to these downpipes is that the installation requires unbolting the engine mount and raising the whole engine in order to install them. Other than that they seem like a steal, 200 cell metal cats and a flex joint. You usually see those expansion bellows on higher-priced downpipes.
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