{"product_id":"h22-h-series-billet-intake-manifold-ase","title":"H22 H Series Billet Intake Manifold | ASE","description":"\u003cp\u003eThis is the Autosports Engineering Billet Intake Manifold for H Series Engines — a one-piece billet unit developed over roughly three years from the proven ASE DIY manifold kit, with runner geometry validated on a SuperFlow bench before anything was committed to aluminum.\u003c\/p\u003e\n\u003ch3\u003eFitment — read before ordering\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDesigned around H22 VTEC swap installations in Civic and Integra chassis.\u003c\/strong\u003e Accord and Prelude applications are possible but \u003cstrong\u003erequire modification to the rear transmission bracket\u003c\/strong\u003e — the manifold will not clear without it. If you are running the engine in its original chassis, plan for that work before you order.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBillet 6061-T6 aluminum, machined in-house in the USA\u003c\/li\u003e\n\u003cli\u003e8 × 14mm injectors, dual injector configuration\u003c\/li\u003e\n\u003cli\u003e90mm Ford-style throttle body flange — fits AEB, K-Tuned, Skunk2 and other standard 90mm patterns\u003c\/li\u003e\n\u003cli\u003eBig bore fuel rail included\u003c\/li\u003e\n\u003cli\u003eThermal plenum gaskets\u003c\/li\u003e\n\u003cli\u003eNPT ports for booster and vacuum\u003c\/li\u003e\n\u003cli\u003eSide and center feed options\u003c\/li\u003e\n\u003cli\u003eSixteen-bolt plenum retention\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat the design does differently\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurved runners.\u003c\/strong\u003e Straight runners on a front-wheel-drive car tend to put the plenum into the underside of the hood, particularly with spacers. Curving them solves hood clearance, eases charge piping routing, and clears the transmission bracket.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRound plenum port entry with a long transition.\u003c\/strong\u003e The oval-to-round transition is stretched over a longer distance than the DIY kit, which helps air speed and velocity and keeps the charge off the runner walls — reducing intake air temperature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeliberate internal surface finish.\u003c\/strong\u003e Rough enough to aid air speed and hold IAT down, smooth enough not to restrict. Polishing the runners smooth is a common assumption and the wrong answer.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSixteen bolts and a wider, thicker gasket surface\u003c\/strong\u003e with the bolt holes brought inboard, so bolts backing out between rounds doesn't turn into a boost leak.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBolted rather than welded.\u003c\/strong\u003e If an engine lets go, the plenum comes off and the manifold can be cleaned out. Welded assemblies trap debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-referenced injector angle.\u003c\/strong\u003e Kept close to Honda's original rather than reoriented for machining convenience, preserving atomization at low air speed so idle and cruise fuel trims stay manageable.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBowed plenum back plate\u003c\/strong\u003e for additional plenum volume.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eRoughly seven to eight hours of machine time per manifold.\u003c\/p\u003e\n\u003ch3\u003eThe development story\u003c\/h3\u003e\n\u003cdiv style=\"position:relative;padding-bottom:56.25%;height:0;overflow:hidden;margin-bottom:1.5rem;\"\u003e\n\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/YrHZ437J7YE\" title=\"Intake Manifold Design Is Revealed: Worth The Wait\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen loading=\"lazy\"\u003e\u003c\/iframe\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/ase-billet-honda-intake-manifold-design-development-story\"\u003eRead the full three-part development story →\u003c\/a\u003e — including the flow bench testing at EIC Motorsports that showed 20 CFM swings from inlet radius alone.\u003c\/p\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"FAQPage\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Will this fit an H22 in an Accord or Prelude?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Not without modification. The manifold is designed around H22 VTEC swap installations in Civic and Integra chassis. Accord and Prelude applications require modifying the rear transmission bracket for the manifold to clear.\"}},{\"@type\":\"Question\",\"name\":\"What throttle body fits the ASE H Series billet intake manifold?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The flange is a standardized 90mm Ford-style pattern, so AEB, K-Tuned, Skunk2 and any other throttle body on that bolt pattern will mount directly.\"}},{\"@type\":\"Question\",\"name\":\"Why are the runners curved?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Straight runners on a front-wheel-drive car, especially with spacers, tend to put the plenum into the underside of the hood unless the engine is leaned over. Curved runners solve hood clearance, make charge piping easier to route, and clear the transmission bracket.\"}},{\"@type\":\"Question\",\"name\":\"Are the runners polished inside?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"No, and that is intentional. The internal finish is rough enough to aid air speed and reduce intake air temperature, but smooth enough not to restrict flow. A hyper-smooth runner increases air friction against the wall surface and raises intake air temps.\"}},{\"@type\":\"Question\",\"name\":\"Is the manifold welded or bolted together?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Bolted. Sixteen bolts retain the plenum against a wider, thicker gasket surface with the bolt holes brought inboard. Bolting rather than welding means the manifold can be opened and cleaned out if an engine fails and sends debris into it.\"}},{\"@type\":\"Question\",\"name\":\"How many injectors does it hold?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Eight 14mm injectors in a dual injector configuration. The injection angle is kept close to Honda's original spec to preserve atomization at low air speed, which keeps idle and cruise fuel trims manageable on street driven cars.\"}},{\"@type\":\"Question\",\"name\":\"What finishes are available?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Silver, Black and Gold, and Black Silver.\"}}]}\u003c\/script\u003e\u003cscript type=\"application\/ld+json\"\u003e{\"@context\":\"https:\/\/schema.org\",\"@type\":\"VideoObject\",\"name\":\"Intake Manifold Design Is Revealed: Worth The Wait\",\"description\":\"Autosports Engineering reveals the finished billet intake manifold design for Honda B Series, K Series and H Series applications, covering curved runner geometry, plenum sealing, injector angle and stack height decisions after months of flow bench development.\",\"thumbnailUrl\":\"https:\/\/i.ytimg.com\/vi\/YrHZ437J7YE\/maxresdefault.jpg\",\"uploadDate\":\"2024-07-24T03:50:07Z\",\"duration\":\"PT20M27S\",\"embedUrl\":\"https:\/\/www.youtube.com\/embed\/YrHZ437J7YE\",\"contentUrl\":\"https:\/\/www.youtube.com\/watch?v=YrHZ437J7YE\",\"publisher\":{\"@type\":\"Organization\",\"name\":\"Autosports Engineering\"}}\u003c\/script\u003e","brand":"Autosports engineering","offers":[{"title":"Silver","offer_id":49986229207189,"sku":"13420","price":1799.99,"currency_code":"USD","in_stock":true},{"title":"Black \u0026 Gold","offer_id":49986229239957,"sku":"13460","price":1799.99,"currency_code":"USD","in_stock":true},{"title":"Black Silver","offer_id":49986229272725,"sku":"22503-1","price":1799.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0792\/4544\/3221\/files\/H22_Billet_Intake-7.jpg?v=1790290397","url":"https:\/\/krmotorsportsonline.com\/products\/h22-h-series-billet-intake-manifold-ase","provider":"KR Motorsports","version":"1.0","type":"link"}