BMW is currently delivering the first M4 CSL and one of the first buyers already has the hardcore coupé with one Sports exhaust system modified. Specifically, by Valvetronic designs installed a new system on an alpine white example. The US vehicle is standard without the annoying petrol particle filter (OPF) equipped and for that reason alone already much more attractive acoustically ex works than the CSL vehicles in this country. This is also made possible by the standard rear silencer made of titanium, which saves four kilograms in weight compared to the normal M4 and also on the 3.0CSL is installed. The rest of the exhaust system, as far as we know, is identical to the standard M4 though. Valvetronic Designs installed a custom one on the vehicle from the video Single midpipe tube, which sometimes crackles and crackles a bit annoyingly, but sounds really good under load, in our opinion.
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