{"product_id":"mad-bmw-s58-4-fatboy-single-midpipe-for-g80-m3-g82-g83-m4","title":"MAD BMW S58 4\" Fatboy Single Midpipe for G80 M3 \u0026 G82\/G83 M4","description":"\u003cp\u003e\u003cstrong\u003eLet the S58 sound like it should.\u003c\/strong\u003e The MAD 4\" Fatboy Single Midpipe replaces the restrictive factory dual midsection on the G80 M3 and G82\/G83 M4 with a high-flow, single 4-inch pipe. By simplifying the exhaust path and increasing diameter, this midpipe sharpens throttle response, deepens tone, and helps the turbos move air more efficiently without adding harsh rasp.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4\" Single-Pipe Design\u003c\/strong\u003e — Large-diameter midsection reduces backpressure and frees up exhaust flow.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFatboy Layout\u003c\/strong\u003e — Converts the stock dual setup into a straight-through single pipe for maximum efficiency.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e304 Stainless Steel Construction\u003c\/strong\u003e — Corrosion-resistant material built to handle high heat and hard use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecision Mandrel Bends\u003c\/strong\u003e — Maintains consistent cross-section for smooth flow through the entire midpipe.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect Bolt-On Fitment\u003c\/strong\u003e — Interfaces with factory downpipes and rear section using OEM-style flanges.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSound \u0026amp; Performance Benefits\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDeeper, more aggressive exhaust note that highlights the S58’s character.\u003c\/li\u003e\n  \u003cli\u003eImproved turbo spool and mid-range punch thanks to reduced restriction.\u003c\/li\u003e\n  \u003cli\u003eWeight savings compared to the bulky factory midpipe assembly.\u003c\/li\u003e\n  \u003cli\u003eWorks great with stock rear muffler or aftermarket axle-back systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eThis midpipe is a \u003cstrong\u003ebolt-on upgrade\u003c\/strong\u003e that installs in place of the OEM center section. For best results, use new exhaust hardware and inspect all sealing surfaces. Professional installation is recommended to ensure perfect alignment and leak-free connections.\u003c\/p\u003e\n\n\u003ch2\u003eUsage Notice\u003c\/h2\u003e\n\u003cp\u003eExhaust modifications may not be legal for street use in all regions. \u003cstrong\u003eIntended for off-road, race, or track use where permitted.\u003c\/strong\u003e Always review local regulations before installation.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the MAD 4\" Fatboy Midpipe\u003c\/h2\u003e\n\u003cp\u003eFor S58 owners who want more sound and flow without compromising build quality, the MAD Fatboy 4\" Single Midpipe delivers a simple, effective solution. Engineered for the G80\/G82\/G83 platform, it offers reliable fitment, durable materials, and a tone that matches the performance of your M car.\u003c\/p\u003e","brand":"MAD","offers":[{"title":"Default Title","offer_id":46265993330846,"sku":"MAD-124","price":699.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0428\/9341\/0462\/files\/JGPARTS_68_9673ec1e-50fc-4190-a87f-421d828447cf.png?v=1765101221","url":"https:\/\/www.jgmods.net\/products\/mad-bmw-s58-4-fatboy-single-midpipe-for-g80-m3-g82-g83-m4","provider":"JGMODS","version":"1.0","type":"link"}