{"product_id":"straight-header-for-big-block-gx390-clone-engines-with-mounting-hardware","title":"Straight Header for Big Block GX390 Clone Engines with Mounting Hardware","description":"\u003cp\u003eFor those harnessing the grunt of a GX390 Clone, the straight-line efficiency of the RLV 5437 Header is indispensable, complete with hardware for immediate deployment.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eStraight design maximizes flow velocity, ideal for high-displacement engines craving quick spool-up.\u003c\/li\u003e\n\u003cli\u003eReplaces legacy H-GX-390-M pipes with modern tolerances for better sealing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eThis header's no-nonsense profile cuts through restrictions, channeling exhaust directly to mufflers like WKAS1516 (4104) or WKAM (4106), sold apart. It keeps your big block breathing freely, translating to thunderous acceleration that leaves competitors in the dust.\u003c\/p\u003e\u003cp\u003eOrganizing larger engines can be tricky, but this piece simplifies connections, reducing clutter under the chassis. Builders praise its vibration resistance, ensuring mounts stay tight through bumpy sessions.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHardware Inclusion:\u003c\/strong\u003e Everything needed for a solid install, saving time at the track.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Focus:\u003c\/strong\u003e Emphasizes low-end punch for drag-style starts or heavy kart classes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDurability Edge:\u003c\/strong\u003e Heat-treated materials endure the thermal stresses of big block output.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eStep into the power arena with confidence, knowing your exhaust is tuned for dominance. This header isn't just functional—it's a catalyst for record-breaking runs. SKU: 5437.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the mounting hardware included with this header?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Yes, the RLV 5437 header comes complete with all necessary mounting hardware to ensure a secure and straightforward installation on your GX390 clone engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which mufflers are compatible with this straight header?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e This header is designed to channel exhaust directly to compatible mufflers such as the RLV B91XL (WKAS1516) or the B91MO (WKAM) modified class silencer.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will this header improve my engine's performance?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e The straight-line design maximizes flow velocity, which is ideal for high-displacement engines. It helps reduce exhaust restrictions, leading to quicker spool-up and improved low-end punch for drag-style starts.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is this header durable enough for bumpy track conditions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eA:\u003c\/strong\u003e Absolutely. The header is constructed from heat-treated materials designed to withstand the thermal stresses of big block output, and its profile is engineered to resist vibration, keeping your mounts tight during intense racing sessions.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products From Vendor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wkas1516-silencer-stock-class-1-5-16-model-b91xl-most-popular-stock-class-muffler-wkas1516\"\u003ePopular RLV B91XL Stock Class 1 5\/16-Inch Silencer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/wkam-silencer-modified-class-1-5-16-only-model-b91xlmo-not-legal-for-stock-classes-wkam\"\u003eRLV B91MO Modified Class Silencer - 1-5\/16 Inch - Open\/Modified\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/exf5007-rlv-clone-thick-flange-header-959-id-exf5007\"\u003eRLV EXF5007 Thick Flange Clone Header with 0.959 Inch ID for Power Gains\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/5434-rlv-thick-flange-clone-header-j-style-5434\"\u003eRLV Thick Flange J-Style Clone Header for Robust GX200 Performance\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"\/products\/5435-rlv-clone-gx200-wide-power-band-j-style-header-5435\"\u003eRLV Wide Power Band J-Style Header for GX200 Clone Engines with Hardware\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SwiftKarting","offers":[{"title":"Default Title","offer_id":48157944643843,"sku":"5437","price":41.75,"currency_code":"USD","in_stock":true}],"url":"https:\/\/phishstonesproducts.myshopify.com\/products\/straight-header-for-big-block-gx390-clone-engines-with-mounting-hardware","provider":"PhishStones Products","version":"1.0","type":"link"}