{"product_id":"zx6r-636-velocity-stack-set-pa12-cf","title":"Kawasaki Ninja ZX-6R 636 (2013–2026) Velocity Stacks — PA12-CF","description":"\u003ch2\u003eBuilt for the airbox, not adapted to it\u003c\/h2\u003e\n\u003cp\u003eA velocity stack only does its job if it sits where the engine wants it. This set is a staggered pair of lengths — the longer pair for cylinders 2 and 3, the shorter for 1 and 4 — matched to the airbox roof clearance so the bell mouths sit in clean air rather than against the lid.\u003c\/p\u003e\n\u003cp\u003eEach stack seats directly onto the throttle body with no adapters, no trimming and no hardware. The mouth is a continuous radiused bell, blended into a straight throat, so the air turns once and keeps turning the same way.\u003c\/p\u003e\n\u003ch2\u003eCarbon-fibre nylon, because an airbox is a hostile place\u003c\/h2\u003e\n\u003cp\u003eThese are printed in PA12-CF — nylon 12 reinforced with 20% chopped carbon fibre. It is the same polymer family the industry uses for fuel lines, and that is the point: an intake sits in heat, vibration and fuel vapour, and most printed parts are made from materials that tolerate none of the three.\u003c\/p\u003e\n\u003cp\u003ePublished properties for the material:\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat deflection\u003c\/td\u003e\n\u003ctd\u003e176 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile strength\u003c\/td\u003e\n\u003ctd\u003e86–100 MPa\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eElongation at break\u003c\/td\u003e\n\u003ctd\u003e13.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCarbon fibre content\u003c\/td\u003e\n\u003ctd\u003e20%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003cp\u003eThat last number matters more than it looks. Elongation is toughness — the ability to absorb a vibration cycle instead of cracking through it. Carbon-filled PET and PETG typically manage a third of it. An intake tract is a fatigue environment, and stiffness without toughness is how parts fail there.\u003c\/p\u003e\n\u003ch2\u003eSpacers included\u003c\/h2\u003e\n\u003cp\u003eFour spacers ship with the set. They set the stack height in the airbox and let you run the geometry as designed rather than as it happens to land.\u003c\/p\u003e\n\u003ch2\u003eMade in Indianapolis\u003c\/h2\u003e\n\u003cp\u003eDesigned, produced and inspected in-house. Every set is dimensionally checked against the reference datums before it ships.\u003c\/p\u003e\n\u003ch2\u003eKey features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTuned-length set — longer pair for cylinders 2 and 3, shorter for 1 and 4\u003c\/li\u003e\n\u003cli\u003ePA12-CF construction — nylon 12 with 20% chopped carbon fibre, 176 °C heat deflection\u003c\/li\u003e\n\u003cli\u003eFuel- and heat-resistant — the polymer family used for automotive fuel lines\u003c\/li\u003e\n\u003cli\u003eDirect fit — seats on the throttle body, no adapters, no trimming, no hardware\u003c\/li\u003e\n\u003cli\u003eContinuous radiused bell mouth blended into a straight throat\u003c\/li\u003e\n\u003cli\u003eFour spacers included to set stack height\u003c\/li\u003e\n\u003cli\u003eDesigned and made in Indianapolis, USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eKawasaki Ninja ZX-6R 636, 2013–2026\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003ePA12-CF (nylon 12, 20% chopped carbon fibre)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003eMatte carbon black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat deflection temperature\u003c\/td\u003e\n\u003ctd\u003e176 °C (material)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTensile strength\u003c\/td\u003e\n\u003ctd\u003e86–100 MPa (material)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet contents\u003c\/td\u003e\n\u003ctd\u003e2 × long stack, 2 × short stack, 4 × spacers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eNo adapters, trimming or hardware required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eDesigned and manufactured in Indianapolis, Indiana, USA\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eWhat’s in the box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e2 × long velocity stack (cylinders 2 and 3)\u003c\/li\u003e\n\u003cli\u003e2 × short velocity stack (cylinders 1 and 4)\u003c\/li\u003e\n\u003cli\u003e4 × stack spacer\u003c\/li\u003e\n\u003cli\u003eFitting instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003ch3\u003eWill these fit my year?\u003c\/h3\u003e\n\u003cp\u003eThe set is built for the 636-engined ZX-6R. Check your year against the fitment finder before ordering — the ZX-6R has run both 599 cc and 636 cc engines across its life, and they are not interchangeable.\u003c\/p\u003e\n\u003ch3\u003eDo I need to re-tune?\u003c\/h3\u003e\n\u003cp\u003eAny intake change alters how the engine breathes. On a stock or lightly modified bike most riders run them as-is; if you are already running a tune, have your tuner account for the change.\u003c\/p\u003e\n\u003ch3\u003eIs this a track-only part?\u003c\/h3\u003e\n\u003cp\u003eThe set does not alter emissions equipment. Check your local regulations for road use.\u003c\/p\u003e\n\u003ch3\u003eWhy nylon and not aluminium or carbon fibre?\u003c\/h3\u003e\n\u003cp\u003eWeight, and the shape. A radiused bell is expensive to machine and awkward to lay up. Carbon-filled nylon gets the geometry right, survives the environment, and does not add mass at the top of the engine.\u003c\/p\u003e\n\u003ch3\u003eCan I buy a single stack?\u003c\/h3\u003e\n\u003cp\u003eThe set is sold complete because the lengths are staggered; a single stack would not be the right length for an arbitrary cylinder. Contact us for replacements.\u003c\/p\u003e\n","brand":"Rogue Performance","offers":[{"title":"Default Title","offer_id":52833151058052,"sku":null,"price":385.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1029\/4070\/4900\/files\/01_hero_long_funnel.png?v=1789709933","url":"https:\/\/rogueperformanceusa.com\/products\/zx6r-636-velocity-stack-set-pa12-cf","provider":"Rogue Performance","version":"1.0","type":"link"}