The Supersprint exhaust for the 2009-2012 Porsche Cayman S produces a substantial gain in performance, and delivers an unbelievably sound.
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https://www.supersprint.com/ww-en/supersprint-performance-sport-exhaust-for-porsche-987-cayman-s-v1.aspx
The 3.4l engine has a bigger potential, which is limited by the diminutive std. manifolds and catalytic, unfortunately.
Also, the internally baffled, convoluted rear muffler design compounds to an excessive exhaust gas backpressure.
The PSA flap exhaust option is only a gimmick that offers nothing else than increasing volume, leaving the performance unchanged.
This car is in serious need of help.
The Supersprint handcrafted long tube headers, the HJS Motorsport high volume catlytics and the free-flowing rear muffler all work in unison to reduce the resistence to a bare minimum, letting the engine finally breathe as easily as it should.
The final result is a substantial gain in peak hp and in midrange torque.
Also, the flat-6 sound is enhanced greatly, with no rasp.
Installation is the easy, straightforward process as usual, fit and finish are top notch; a trademark of Supersprint.