{"title":"Shop by Engine","description":"BMW parts grouped around engine-code fitment so shoppers can start with B58, S58, S55, N55, or N54 before narrowing by chassis and part category.","products":[{"product_id":"mad-bmw-s58-3-5-fat-boy-downpipes-m2-m3-m4-g87-g80-g82-g83","title":"MAD BMW S58 3.5\" Fat Boy Downpipes M2 M3 M4 G87 G80 G82 G83","description":"\u003cp\u003e\u003cstrong\u003eThe MAD 3.5\" S58 Fat boy is the largest BMW S58 catless downpipe on the market!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUpgrade from the stock S58 downpipes to the MAD 3.5\" Fat Boy  S58 catless downpipes for maximum airflow, power, and sound!\u003c\/p\u003e\n\u003cp\u003eUpgrade to the MAD BMW 3.5\" Fat Boy  S58 downpipes to eliminate the backpressure caused by your stock catalytic converters. By upgrading to our downpipes, your turbos can now spool faster and achieve maximum power. 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