{"product_id":"hks-super-turbo-muffler-toyota-gr-supra-3-0-a90-a91","title":"HKS Super Turbo Muffler – Toyota GR Supra 3.0 A90\/A91","description":"\u003cdiv class=\"sl-desc\"\u003e\n\u003ch2\u003eOVERVIEW\u003c\/h2\u003e\n\u003cp\u003eHKS makes two exhausts for the 3.0 GR Supra with two different goals, and the Super Turbo Muffler is the one built for power and comfort. Its full straight layout removes the narrow points in the factory system to improve exhaust flow, giving a moderately sporty sound without the unpleasant drone, and it meets Japan's noise regulations. The 110 mm tips use HKS's slotted inner design for extra sound control, with a titanium gradation finish sized to suit the bumper cut-outs.\u003c\/p\u003e\n\u003cp\u003eBoth versions reuse the factory exhaust valve control and actuator, so the valve can still be switched from the cockpit and the car keeps its Normal and Sport sound modes.\u003c\/p\u003e\n\u003cp\u003eTwo versions are offered. 31029-AT003 replaces the exhaust from the first mid pipe back and is for cars without an OPF (gasoline particulate filter); HKS states that 31029-AT003, AT007 and AT008 are the same physical product, so it also covers later 3.0 automatic and 6-speed manual cars. 31029-AT004 is the main muffler only: it connects to the factory mid pipe, works with or without an OPF, and is EU certified.\u003c\/p\u003e\n\u003ch2\u003eSPECS\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e31029-AT003: Super Turbo Muffler (SSR), SUS304, 110 mm tips L\u0026amp;R, center pipe 85 → 70 mm × 2\u003c\/li\u003e\n\u003cli\u003e31029-AT003: proximity noise 87 dB (stock 85 dB), idle 61 dB (stock 58 dB)\u003c\/li\u003e\n\u003cli\u003e31029-AT003: minimum ground clearance 111 mm, weight 24.7 kg (stock 26.7 kg), certification JARI10200001P\u003c\/li\u003e\n\u003cli\u003e31029-AT004: main muffler only, SUS304L, 110 mm tips L\u0026amp;R, center pipe 80 → 70 mm × 2\u003c\/li\u003e\n\u003cli\u003e31029-AT004: proximity noise 87 dB (stock 85 dB), ground clearance 125 mm, weight 23.9 kg\u003c\/li\u003e\n\u003cli\u003e31029-AT004: works with and without OPF; EU certified\u003c\/li\u003e\n\u003cli\u003eBoth: reuse the factory exhaust valve control and actuator; Normal \/ Sport switching retained\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePARTS INCLUDED\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e31029-AT003: HKS Super Turbo Muffler system from the first mid pipe back, with twin tips and hardware\u003c\/li\u003e\n\u003cli\u003e31029-AT004: HKS Super Turbo Muffler main muffler with twin tips and hardware; the factory mid pipe is retained\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTECH RESOURCES\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired extras:\u003c\/strong\u003e none. The factory exhaust valve actuator is transferred to the HKS system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended:\u003c\/strong\u003e fresh exhaust flange gaskets and nuts, as the factory hardware is often damaged on removal.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation manual, 31029-AT004 (HKS):\u003c\/strong\u003e \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/hks-31029-AT004-installation-instructions_3a271bc2-6b7c-4ae8-87a5-6286fbc2e560.pdf?v=1788215773\"\u003e31029-AT004 Super Turbo Muffler installation manual (PDF)\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31029-AT004 install note:\u003c\/strong\u003e HKS has the factory muffler cut at the mid-pipe service separation point, and the HKS muffler connects there. Professional installation recommended.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31029-AT003 installation notes:\u003c\/strong\u003e HKS does not publish a manual for this part. Raise and support the car, unbolt the factory system from the first mid pipe back, transfer the exhaust valve actuator, then hang the HKS system on the OEM rubber mounts and align the tips before final torque.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhich one?\u003c\/strong\u003e No OPF and want the full system → 31029-AT003. Car has an OPF, or you want to keep the factory mid pipe → 31029-AT004.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWant it louder?\u003c\/strong\u003e See the \u003ca href=\"https:\/\/speedlogicauto.com\/products\/hks-dual-muffler-exhaust-toyota-gr-supra-3-0-a90-a91\"\u003eHKS Dual Muffler for the GR Supra 3.0\u003c\/a\u003e. \u003cstrong\u003e2.0 B48 car?\u003c\/strong\u003e See the \u003ca href=\"https:\/\/speedlogicauto.com\/products\/hks-super-turbo-muffler-toyota-gr-supra-2-0-a90\"\u003eHKS Super Turbo Muffler for the GR Supra 2.0\u003c\/a\u003e.\u003c\/li\u003e\n\u003cli\u003eNo CARB EO is published for 31029-AT003 — off-road \/ competition use only in California.\u003c\/li\u003e\n\u003cli\u003ePrice is for the item selected only; labor is not included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePART NUMBER\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e31029-AT003\u003c\/strong\u003e — HKS Super Turbo Muffler, GR Supra 3.0 B58, non-OPF (same product as 31029-AT007 \/ 31029-AT008)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e31029-AT004\u003c\/strong\u003e — HKS Super Turbo Muffler main muffler, GR Supra 3.0 B58, with or without OPF\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\u003eToyota\u003c\/td\u003e\n\u003ctd\u003eGR Supra 3.0 (automatic)\u003c\/td\u003e\n\u003ctd\u003eA90\/A91 (DB42 \/ DB02)\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2020+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eToyota\u003c\/td\u003e\n\u003ctd\u003eGR Supra 3.0 (6-speed manual)\u003c\/td\u003e\n\u003ctd\u003eA90 (DB06)\u003c\/td\u003e\n\u003ctd\u003eB58 3.0L Turbo I6\u003c\/td\u003e\n\u003ctd\u003e2023+\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e","brand":"HKS","offers":[{"title":"Super Turbo Muffler full system, non-OPF (31029-AT003)","offer_id":52569433014552,"sku":"31029-AT003","price":3750.0,"currency_code":"USD","in_stock":true},{"title":"Super Turbo Muffler main muffler, with or without OPF (31029-AT004)","offer_id":52569433047320,"sku":"31029-AT004","price":2990.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2307\/8117\/files\/N4USwUGnNJ6RWaFp5oLO56ksWjgnX03geCHUOQRI.jpg?v=1793228522","url":"https:\/\/speedlogicauto.com\/products\/hks-super-turbo-muffler-toyota-gr-supra-3-0-a90-a91","provider":"SPEED LOGIC","version":"1.0","type":"link"}