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HELICAL exhaust valves are the 1 and ONLY exhaust valve that any GT4RS
They are fighting knockback
The factory exhaust mutes the turbochargers
The dynamic load placed on the caliper twists or pulls the caliper into a parallelogram shape
Plug-and-play valves that completely retain the factory exhaust valve functionality
Kline Valvetronic Cat Back Exhaust w/OAP 718 Cayman/Boxster GTS 4.0 | GT4 | Spyder w/Heat Shield Optional Tips::Inconel 625 HELICAL exhaust valves are theKline Valvetronic Cat Back Exhaust w OAP 718 Cayman Boxster GTS 4. 0 GT4 Spyder. The Porsche Cayman 718 gt4, revered as the pinnacle of track orientated weaponry, at 414 hp the flat 6 has the power to weight ratio to put in some blistering lap times. So how could we improve on this epic automobile? Add lightness, tune the sound, and add performance! THE SOUND Removal of the heavy chambered rear silencer, and replacing it with a lightweight F1 grade
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