{"product_id":"speedfactory-ram-horn-turbo-manifold-06-11-civic-si","title":"SpeedFactory Ram Horn Turbo Manifold for 06-11 Civic Si","description":"\u003cul\u003e\n\u003cli\u003eBroad powerbands \u003c\/li\u003e\n\u003cli\u003eEqual length 1.5 in stainless steel \u003c\/li\u003e\n\u003cli\u003eCNC machined half inch steel flanges \u003c\/li\u003e\n\u003cli\u003eSingle 44\/46mm V-band wastegate flange \u003c\/li\u003e\n\u003cli\u003eSpools large frame turbos quickly \u003c\/li\u003e\n\u003cli\u003eFitment for 06-11 Civic Si K20\/K24 \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e  \u003cli\u003e\u003ca href=\"#TechnicalData\"\u003eTechnical Data\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\n\u003ch3\u003eSpeedFactory Ram Horn Turbo Manifold for the 06-11 Civic Si\u003c\/h3\u003e\n\u003cp\u003eThe 8th gen Civic Si is one of the cheapest ways into a genuinely fast K series car, and the K20Z3 takes boost far better than its 197 factory horsepower suggests. If you're building an 8th gen Civic Si turbo setup around a big turbo, the manifold decides whether that power shows up early or all at once at redline. The SpeedFactory Ram Horn is the equal length option for FG2 and FA5 owners chasing serious numbers.\u003c\/p\u003e\n\u003ch3\u003eWhat It Is and Why It Works\u003c\/h3\u003e\n\u003cp\u003eThis is an equal length, TIG welded turbo manifold for the 2006-2011 Civic Si, built from 1.5 inch Schedule 40 stainless steel and back purged during welding. Back purging keeps the inside of each weld from oxidizing, which is where thermal cracks start on manifolds that see sustained exhaust heat. The cylinder head, wastegate, and turbine inlet flanges are CNC machined from half inch 1018 steel plate with machined-flat mating surfaces, so you're not chasing exhaust leaks from a warped flange.\u003c\/p\u003e\n\u003cp\u003eThe equal length runner design is the point of a ram horn. Every cylinder's exhaust pulse travels the same distance to the collector, which keeps the pulses evenly spaced and drives the turbine harder at lower RPM. In practice that means this manifold spools even large frame turbos quickly and carries a broad powerband to the top of the K20's rev range instead of trading all your midrange for a peak number. SpeedFactory positions it for high power and drag race applications, and that's the honest read: this is the manifold for the build where a bolt-on kit's mid-frame turbo isn't the end goal.\u003c\/p\u003e\n\u003cp\u003ePlatform context matters here. A stock-bottom-end K20Z3 with a proper tune lives happily in the mid 300whp range on pump gas at conservative boost. Past roughly 500whp you're into lower compression and built internals territory, and this manifold has flow headroom well beyond that. If your target is a modest daily-driver setup around 300whp, the Ram Horn still works, but you're paying for capacity you may never use.\u003c\/p\u003e\n\u003ch3\u003eSpecs\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5 inch Schedule 40 stainless steel, TIG welded, back purged\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRunner design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEqual length, ram horn style\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFlanges\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCNC machined half inch 1018 steel plate, machined flat\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTurbine inlet\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eT3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWastegate flange\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle 44\/46mm V-band\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTurbo sizing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBuilt to spool large frame turbos\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuild type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade to order by SpeedFactory\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWelding defects only, per manufacturer (see below)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eFitment\u003c\/h3\u003e\n\u003c!-- FITMENT DISCREPANCY: productFitmentTags contain 19 corrupted entries spanning 1984-2026 including FL5 and 2022+ Civics. Correct fitment per the live PIM fitments array and SpeedFactory's published confirmed fitments is 2006-2011 Civic Si only. Tags must be purged before publish. --\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eYear\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eMake\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eChassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2006-2011\u003c\/td\u003e\n\u003ctd\u003eHonda\u003c\/td\u003e\n\u003ctd\u003eCivic Si\u003c\/td\u003e\n\u003ctd\u003eFG2 coupe, FA5 sedan\u003c\/td\u003e\n\u003ctd\u003eK20 \/ K24\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eSpeedFactory confirms fitment for the 06-11 Civic Si with both K20 and K24 engines, so K24 swap and stroker builds in the 8th gen chassis are covered, not just the factory K20Z3. This manifold is chassis-specific: it is not the same part as SpeedFactory's EG\/EK\/DC swap manifolds, and it won't cross over.\u003c\/p\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3\u003eWhat to Know Before You Buy\u003c\/h3\u003e\n\u003cp\u003eDo not heat wrap this manifold. SpeedFactory's warranty covers welding defects only, for the original purchaser, and is voided on any manifold that's been heat wrapped or run with an improper downpipe or dump tube. Wrap traps heat in the tubing and cracks stainless manifolds, which is exactly why the exclusion exists. If you need to manage underhood temps, ceramic coating is the path that doesn't void anything.\u003c\/p\u003e\n\u003cp\u003eBuild the whole exhaust side right. A large frame turbo on any tubular manifold needs a downpipe that supports its own weight instead of hanging it off the collector, and the wastegate dump needs proper routing. SpeedFactory asks for photos of the installed setup on warranty claims, and an unsupported turbo is the fastest route to a cracked manifold and a denied claim.\u003c\/p\u003e\n\u003cp\u003ePlan the supporting build before the manifold ships. These are made to order by SpeedFactory and typically take several weeks, sometimes more than a month. Use that window to sort the external wastegate for the 44\/46mm V-band flange, fuel system, clutch, and engine management, because a K20Z3 under real boost needs a proper tune on FlashPro or equivalent before it sees full throttle. If you're unsure whether your turbo, gate, and boost target play well with this manifold, talk to us before ordering. A made-to-order part is a bad thing to guess on.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n 2006-2011 Civic Si (K20\/K24 engines) \n\u003c\/li\u003e\n\n\n\n\n\u003cli id=\"TechnicalData\"\u003e\n1.5\" schedule 40 stainless steel \u003cdiv\u003eCylinder head, wastegate, turbine inlet flanges-1\/2 plate 1018 steel\u003c\/div\u003e\n\u003c\/li\u003e\n\n\n\n \n\u003cli id=\"Included\"\u003e\n\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"SpeedFactory","offers":[{"title":"Default Title","offer_id":45917528522786,"sku":"SFR-04-047","price":1100.23,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/SFR-04-047_kl9x.jpg?v=1783541560","url":"https:\/\/www.hybrid-racing.com\/products\/speedfactory-ram-horn-turbo-manifold-06-11-civic-si","provider":"Hybrid Racing","version":"1.0","type":"link"}