Supersprint has come up with, and developed one of the most clever exhaust ideas, in order to getting the maximum increase in performance on the 2017-2018 Porsche 911 Carrera 4 GTS, the version equipped with the Sport exhaust with the tips exiting in the middle of the rear bumper.
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https://www.supersprint.com/ww-en/supersprint-performance-sport-exhaust-for-porsche-911-9912-carrera-4-gts-30i-turbo-v1.aspx
A set of high flowing catlytics, which bolt-on directly to the std. Porsche muffler.
Since the Porsche genuine, flap-rear muffler already is free-flowing, making no resistence to the exhaust gas, it leaves no room for improvement.
Instead, the factory R&L catalytics are the real bottleneck, keeping the engine from reaching its full potential.
This is the only area of the exhaust where our R&D guys have focused their efforts on.
Supersprint's own cat sections eliminate that restriction, thanks to the HJS Motorsport, high volume metallic cats, but most important, to the smooth connections, Supersprint's proprietary, progressive merge cones.
By simply bolting on the Supersprint R&L catalitycs to the factory muffler, the flowing improves immensely.
The engine can now be tuned to 500+ Hp, by increasing the boost pressure, with no side effect on the reliability of the turbochargers.
The function of the std. flaps (which provide for the dual-sound mode), remains intact.