{"product_id":"ngk-94201-laser-iridium-spark-plug-set-bmw-b58-gen-1-b46-b48","title":"NGK 94201 Laser Iridium Spark Plug Set – BMW B58 Gen 1 \/ B46 \/ B48","description":"\u003cstyle\u003e.sl-desc h2{font-size:1.15em;letter-spacing:.06em;text-transform:uppercase;border-bottom:2px solid #111;padding-bottom:6px;margin:1.6em 0 .7em}.sl-desc ul{margin:0 0 1em 1.2em}.sl-desc li{margin:.25em 0}.va-table{width:100%;border-collapse:collapse;margin:.5em 0 1em;font-size:.95em}.va-table th{text-align:left;padding:10px 8px;border-bottom:2px solid #333;white-space:nowrap}.va-table td{padding:8px;border-bottom:1px solid #e5e5e5;vertical-align:top}.sl-note{font-size:.9em;color:#555;margin:.4em 0 1em}\u003c\/style\u003e\n\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eThe NGK 94201 (SILZKGR8B8S) is the OE-specification Laser Iridium spark plug for BMW's Gen 1 B46 \/ B48 four-cylinder and Gen 1 B58 six-cylinder turbo engines. Speed Logic stocks it for stock cars and for tuned applications on pump gas, E85 or water\/methanol injection, including upgraded-turbo builds.\u003c\/p\u003e\n\u003cp\u003eIt pairs a fine-wire iridium center electrode with a projected square platinum pad on the ground electrode for even wear in coil-on-plug ignition systems. The laser-welded iridium tip is roughly six times harder than platinum, and the alumina ceramic insulator with a 98% pure copper core carries heat away from the firing end for reliable starts and long service life under boost.\u003c\/p\u003e\n\u003cp\u003eSold as a matched set — 4 plugs for the four-cylinder B46\/B48 or 6 plugs for the six-cylinder B58 Gen 1. Speed Logic only sells genuine NGK spark plugs sourced through NGK's authorized distribution; counterfeits are common on eBay, Amazon and similar marketplaces.\u003c\/p\u003e\n\u003ch2\u003eSPECS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eType: NGK Laser Iridium (High Ignitability)\u003c\/li\u003e\n\u003cli\u003eNGK stock number 94201 \/ plug number SILZKGR8B8S\u003c\/li\u003e\n\u003cli\u003eHeat range: 8 (OE heat range for B46 \/ B48 Gen 1 \/ B58 Gen 1)\u003c\/li\u003e\n\u003cli\u003eThread size: M12 x 1.25\u003c\/li\u003e\n\u003cli\u003eThread reach: 26.5 mm (1.043 in)\u003c\/li\u003e\n\u003cli\u003eSeat type: flat (gasket)\u003c\/li\u003e\n\u003cli\u003eHex size: 14 mm 12-point (bi-hex)\u003c\/li\u003e\n\u003cli\u003eCenter electrode: fine-wire iridium, copper core\u003c\/li\u003e\n\u003cli\u003eGround electrode: projected square platinum electrode (PSPE), copper core\u003c\/li\u003e\n\u003cli\u003eResistor: yes, 5 kΩ\u003c\/li\u003e\n\u003cli\u003eGap: factory preset 0.030 in (0.75 mm); 0.022 in suggested for tuned \/ upgraded-turbo applications\u003c\/li\u003e\n\u003cli\u003eDirect OE-fit replacement — no tuning or ECU change required to install\u003c\/li\u003e\n\u003cli\u003eSold as a matched set: 4 plugs (B46 \/ B48) or 6 plugs (B58 Gen 1)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePARTS INCLUDED\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSet of (4) genuine NGK 94201 Laser Iridium spark plugs — B46 \/ B48 Gen 1 four-cylinder engines, or\u003c\/li\u003e\n\u003cli\u003eSet of (6) genuine NGK 94201 Laser Iridium spark plugs — B58 Gen 1 six-cylinder engines (per variant selected)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTECH RESOURCES\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdditional parts required: None.\u003c\/strong\u003e NGK specifies no additional hardware for the NGK 94201 (SILZKGR8B8S); it is a direct drop-in replacement for the OE plug.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstaller-supplied tools (not sold by Speed Logic):\u003c\/strong\u003e 14 mm 12-point (bi-hex) thin-wall spark plug socket — a standard 5\/8\" plug socket will not fit — plus a torque wrench and a wire\/feeler gauge if you intend to adjust the gap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e NGK does not publish a part-specific installation document for the NGK 94201. Follow NGK's official guidance: \u003ca href=\"https:\/\/ngk.com.au\/technical_info\/installation\/\" target=\"_blank\" rel=\"noopener\"\u003eNGK Spark Plug Installation\u003c\/a\u003e and \u003ca href=\"https:\/\/ngk.com.au\/technical_info\/electrode-gap-adjustment\/\" target=\"_blank\" rel=\"noopener\"\u003eNGK Electrode Gap Adjustment\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eWork on a cold engine. Blow debris out of the plug wells before removing the ignition coils, thread each plug in by hand until the gasket seats, then torque to the BMW factory specification for your engine (NGK's general figure for 12 mm gasket-seat plugs in aluminum heads is 15–20 Nm \/ 11–14.5 lb-ft). Do not apply anti-seize — NGK's trivalent-plated shell already prevents seizing and anti-seize leads to over-torquing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGap:\u003c\/strong\u003e factory preset at 0.030 in (0.75 mm). Speed Logic suggests 0.022 in for tuned or upgraded-turbo cars; stock cars can run the factory gap. If you re-gap, adjust the ground electrode only with a proper gapping tool — never pry against the fine-wire iridium center electrode. Pre-gapped sets are available on request; \u003ca href=\"\/pages\/contact-us\"\u003econtact Speed Logic\u003c\/a\u003e with your setup.\u003c\/li\u003e\n\u003cli\u003eClear any stored misfire codes after installation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRelated NGK plugs:\u003c\/strong\u003e this part covers Gen 1 engines only — S58 and B58 \/ B48 Gen 2 (2019+ G-chassis) engines use the \u003ca href=\"\/products\/ngk-laser-iridium-spark-plug-96206-silzkgr8e8s\"\u003eNGK 96206 Laser Iridium Spark Plugs\u003c\/a\u003e; N20 \/ N26 \/ N54 \/ N55 \/ S55 engines use the \u003ca href=\"\/products\/ngk-97506-laser-iridium-spark-plug-set-bmw-n54-n55-n20-n26-s55\"\u003eNGK 97506 Laser Iridium Spark Plug Set\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eInstall or gap questions? \u003ca href=\"\/pages\/contact-us\"\u003eContact Speed Logic\u003c\/a\u003e — we also install in-house at our Westminster, CA shop.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePART NUMBER\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e94201\u003c\/strong\u003e — NGK stock number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSILZKGR8B8S\u003c\/strong\u003e — NGK plug number\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eVEHICLE APPLICATIONS\u003c\/h2\u003e\n\u003ctable class=\"va-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eChassis\u003c\/th\u003e\n\u003cth\u003eEngine\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e230i\u003c\/td\u003e\n\u003ctd\u003eF22 \/ F23\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e330i\u003c\/td\u003e\n\u003ctd\u003eF30\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e430i\u003c\/td\u003e\n\u003ctd\u003eF32 \/ F33\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e430i Gran Coupe\u003c\/td\u003e\n\u003ctd\u003eF36\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e530i\u003c\/td\u003e\n\u003ctd\u003eG30\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX3 xDrive30i\u003c\/td\u003e\n\u003ctd\u003eG01\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2018–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX4 xDrive30i\u003c\/td\u003e\n\u003ctd\u003eG02\u003c\/td\u003e\n\u003ctd\u003eB46 \/ B48 2.0L Turbo I4 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2019–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eM240i\u003c\/td\u003e\n\u003ctd\u003eF22 \/ F23\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e340i\u003c\/td\u003e\n\u003ctd\u003eF30\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2016–2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e440i\u003c\/td\u003e\n\u003ctd\u003eF32 \/ F33\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e440i Gran Coupe\u003c\/td\u003e\n\u003ctd\u003eF36\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e540i\u003c\/td\u003e\n\u003ctd\u003eG30\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2017–2020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003e740i\u003c\/td\u003e\n\u003ctd\u003eG11\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2016–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX3 M40i\u003c\/td\u003e\n\u003ctd\u003eG01\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2018–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBMW\u003c\/td\u003e\n\u003ctd\u003eX4 M40i\u003c\/td\u003e\n\u003ctd\u003eG02\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6 (Gen 1)\u003c\/td\u003e\n\u003ctd\u003e2019–2021\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"NGK","offers":[{"title":"Set of 4 (4-Cylinder – B46 \/ B48)","offer_id":52573992452376,"sku":"94201-4PK","price":65.0,"currency_code":"USD","in_stock":true},{"title":"Set of 6 (6-Cylinder – B58 Gen 1)","offer_id":52573992812824,"sku":"94201-6PK","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/NGK_Laser_Iridium_Spark_Plug_and_Box.png?v=1792539849","url":"https:\/\/speedlogicauto.com\/products\/ngk-94201-laser-iridium-spark-plug-set-bmw-b58-gen-1-b46-b48","provider":"SPEED LOGIC","version":"1.0","type":"link"}