G01 X3 M40i OPF Decat Downpipe - B48 Stage 2 Fast Road Track Day, Part No XYZ-789

For G01 X3 M40i owners running the B48TU2 engine and wanting a true stage 2 fast road or track day decat downpipe - not an OEM replacement, not a half-measure - this is the one.

• Specific fit: Designed only for G01 X3 M40i with OPF (not G01 X3 xDrive30i, not G01 X4 M40i, not F97 X3 M)
• Material & build: 4.5-inch OD SS304 stainless steel, mandrel-bent, TIG-welded, no flanges cut or repositioned - matches factory turbo outlet and mid-pipe geometry
• What it does: Removes OPF restriction, reduces back pressure, improves spool, supports aggressive B48 stage 2 maps - gains verified with supporting ECU tuning
• What it doesn’t do: Hide warning lights (requires tune), silence your exhaust (expect deeper, sharper tone), or fit without gasket replacement
• Searched as: G01 X3 M40i decat downpipe, B48 catless downpipe, G01 OPF delete downpipe, fast road downpipe G01, track day downpipe B48, stage 2 X3 M40i exhaust