{"product_id":"608-harmonically-damped-underdrive-performance-pulley-kit-986-987-996-997","title":"608 - Harmonically Damped - Underdrive Performance Pulley Kit (986, 987, 996, 997)","description":"\u003cp\u003eA harmonically damped RSS underdrive pulley for street and track use, particularly engines with lightweight flywheels, increased displacement or demanding operating conditions.\u003c\/p\u003e\u003cp\u003eRSS says the pulley reduces accessory drive losses at the steering pump, air-conditioning compressor, coolant pump and alternator while maintaining their function. Damping is intended to limit internal engine harmonics and support efficiency and durability.\u003c\/p\u003e\u003cp\u003eAn installation wrench and a new factory pulley washer are included. A vehicle-specific new crankshaft pulley bolt is recommended and is not included. The correctly sized 6PK belt is available as a $55 option. Made in the USA.\u003c\/p\u003e\u003cp\u003eThe supplier's illustrated test on a 2005 997.1 Carrera S recorded a 16 hp and 8 lb-ft increase after adding this pulley. The test car already had Cargraphic headers, 200-cell catalysts and sport mufflers, with factory software; results depend on the vehicle.\u003c\/p\u003e\u003cp\u003eSupplier part number: 608. Vendor: RSS (Road Sport Supply).\u003c\/p\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eApplicable Porsche 986, 987, 996 and 997 engines. Excludes 2.9-liter engines with the multi-hole crank-pulley pattern, DFI engines, GT2, GT3 and Turbo.\u003c\/p\u003e","brand":"RSS","offers":[{"title":"Pulley kit only","offer_id":56206079590722,"sku":"608","price":600.0,"currency_code":"USD","in_stock":true},{"title":"With 6PK Continental belt (+$55)","offer_id":56206079623490,"sku":"608+6PK","price":655.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0986\/4930\/9506\/files\/rss-608-45.webp?v=1789768875","url":"https:\/\/levinsonperformance.com\/products\/608-harmonically-damped-underdrive-performance-pulley-kit-986-987-996-997","provider":"Levinson Performance \u0026 Mfg.","version":"1.0","type":"link"}