Fi EXHAUST comfort and sport modes can be switched using OEM sport button to regulate the desired sound volume.

With valves OFF enjoy a comfort drive while with valves ON increase aggressive sound by 20% to 117.9dB.

Porsche 971 Panamera 4S 2.9TT installed with a full catless system, which includes a 2nd catless pipe, mid muffler X pipe, valvetronic muffler, catless ultra high flow downpipes and forged carbon quad tips.

Thanks to videographer Kenny Yang.

00:00 Intro
00:57 Valves OFF 97.7dB
01:10 Valves ON 117.9dB
01:19 Acceleration
01:50 Fi EXHAUST
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