{"product_id":"dinan-valved-axle-back-exhaust-system-bmw-g8x-m3-m4","title":"Dinan Valved Axle-Back Exhaust System | BMW G80 M3 \/ G82 M4","description":"The G8x M3\/M4 deserves better than stock exhaust rasp. Dinan's valved axle-back system transforms the S58's thin vocals into a deeper, more aggressive soundtrack—without the cabin drone that plagued earlier generations.\n\nEngineered for versatility, the system uses computer-controlled valves to deliver refined civility at low speeds and full-throttle aggression when you demand it. Larger 76mm piping (vs. 70mm stock) reduces backpressure and unlocks +6 HP and +5 lb-ft of torque. When valves close, sound routes through the Dinan muffler for a subdued, controlled note. Open them up and gases bypass the muffler entirely for near-straight-pipe performance.\n\nBuilt entirely from T304 stainless steel and TIG welded, the system features quad 4.5-inch polished tips that fill factory cutouts perfectly—OEM+ aesthetics with serious attitude. Brush-finished construction and laser-engraved detailing ensure flawless appearance. At 38 pounds, it's 6 pounds lighter than stock while retaining factory valve actuators so you can adjust tone via M-drive settings.\n\nPair it with Dinan's optional middle exhaust for an even louder, smoother, fuller experience. Factory fitment with included hardware makes installation seamless. This is the exhaust the G8x M3\/M4 should have come with.","brand":"Dinan Engineering","offers":[{"title":"Polished","offer_id":42975945424994,"sku":"DN-D660-0093","price":2028.0,"currency_code":"USD","in_stock":true},{"title":"Black Ceramic Coated","offer_id":42975945457762,"sku":"DN-D660-0094","price":2028.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0613\/4395\/7090\/files\/31fd44216ee98faf5753c7862767131993a21d75-16-9-rectangle.jpg?v=1780160420","url":"https:\/\/ortmotorsport.com\/products\/dinan-valved-axle-back-exhaust-system-bmw-g8x-m3-m4","provider":"ORT Motorsport","version":"1.0","type":"link"}