991 GT3 Spring Upgrade KitDescription: Tarett Engineering has put this kit together to upgrade the springs on your 991 GT3. Choose between our Sport kit with 560 front and 672 rear spring rates, our Track kit with 672 front and 840 rear spring rates. Both kits will reduce body roll and improve suspension response. The rates are within the range of the OEM GT3 dampers without needing to be revalved. Other rates available on request. We chose Swift springs for this kit because

) POS MY10S1 Porsche 987 & 986 Cayman/Boxster Front: 70 N/mm (400 lbs/in

More that just your typical collection of generic catalog parts to convert to adjustable coil-overs

Other rates available on request

two sets needed for one car

DSC Sport V1 Controller

This is the newest innovation in valve covers with multiple improvements over any other valve cover on the  market

Manufactured in the USA from hardened USA alloy steel

The two adjusting links have left and right hand threads on each end

+ Fits all Porsche 9872 Cayman/Boxster vehicles with manual transmission (2009-2012)

A perfect combination for hot street or track use

Click on this link for complete Installation Instructions 991

The factory plastic assemblies are notorious for hinge and housing failure due to its flimsy construction that was designed strictly for street use