The CSF 7066 is an all-aluminum left-side radiator for the 991.1 Porsche 911 Carrera and the 981 Boxster, and the manufacturer cross-references it to OE number 991 106 131 03. Unlike a regular oval shape "O" type radiator tube, CSF uses a specially engineered tube in the shape of a "B". The end tanks are 100% TIG-Welded, with CNC-machined brackets and OEM-style inlet and outlet fittings. For track owners, the cooling margin is the real reason to upgrade: the manufacturer acknowledges that overheating and going into limp mode is a common problem for these cars on track.
The fit is designed to match stock, so you are upgrading cooling capacity without re-engineering the front end. The manufacturer describes it as a true "Drop-in fit" design requiring no modifications to install. It also accepts OEM AC Condenser and Fan Shroud, so you can keep your factory air conditioning and shroud setup. Do not confuse this side-mount unit with the GT4 center radiator, which the manufacturer's GT4 conversion guide pairs with CSF #7068.
Shoppers searching for a 991.1 Carrera left radiator, a 981 Boxster left side radiator, or part number 991 106 131 03 will find this unit in the manufacturer's cross-reference. The PIWIS tool is only used for the bleeding process, but you can drain and refill coolant without it, according to user forums, though they still recommend bleeding after any refill.
No. The manufacturer's GT4 center-radiator conversion uses CSF #7068 in the center position. The 7066 is a left side-mount unit for the Carrera and Boxster applications listed in the manufacturer's cross-reference.
The manufacturer lists the 7066 as the replacement for Porsche part number 991 106 131 03 on the left side.
The manufacturer states the radiator is a drop-in fit that requires no modifications, and it accepts the factory AC condenser and fan shroud.
User forums report that a vacuum filler is the usual method for filling the system, and that a proper bleed typically requires a Porsche PIWIS tester. Owners generally recommend bleeding the system after any refill.
Because the radiator is a drop-in replacement, the mechanical swap is mostly a matter of draining the cooling system, disconnecting the hoses and fans, and reinstalling the new unit with the factory shroud. Owners on user forums recommend a vacuum filler for refilling, and they report that a proper bleed usually requires a Porsche PIWIS tester, so plan for that step or a shop visit. Check the O-rings on the coolant connections and replace them if they are worn, and budget for fresh coolant.
