Hello, I am a new member, but I have been following with interest for awhile.
I have communicated with Suncoast to see if they would but together a kit of OEM Porshe parts to put a GT4 rear diffuser onto a GTS 4.0.
GTS 4.0 Rear Diffuser UpgradeSKU: PK71840DIFFUSER
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Ultimately, I find the factory GTS 4.0 rear diffuser to be pretty lame and adding a working one that is OEM is appealing to me. If I did upgrade to the GT4 rear diffuser I would upgrade the front bumper/spoiler as well to keep the balance.
This would basically mimic the aero setup of the new Spyder.