Material Integrity
- Alloy SS304 Stainless
- Gauge 16 AWG
- Weld TIG — Full Penetration
- Finish Brushed Industrial
B58 Platform // Ontario Engineered
Flow Without
5" SS304 Stainless Downpipe for the BMW B58 Engine. 340i · 440i · M340i · GR Supra A90
No Duty. Ships from Ontario.
Guaranteed OEM-Spec Fitment
2–3 Day Delivery, Canada-Wide
Engineering Advantage
Beyond
Beyond
Bolt-Ons
Flow Analysis
- Diameter 5.0" (vs OEM 3.5")
- Transition Bellmouth Taper
- Backpressure Minimized at Turbine Exit
- Velocity Optimized Exhaust Path
Precision Fitment
- Design CAD-Engineered
- Mounting OEM-Spec Points
- Installation True Bolt-On
- Origin Ontario, Canada
SKU: BX-B58-DP-5SS
5" SS304 Stainless Downpipe — B58
$CAD 449
| Diameter | 5.0" (127mm) |
|---|---|
| Material | SS304 Stainless Steel |
| Wall Thickness | 16 Gauge / 1.5mm |
| Weld Process | TIG Welded |
| Flange Type | V-Band + OEM Bolt-On |
| Cat Config | Catless / Catted |
| Weight | 3.2 kg |
| Origin | Ontario, Canada |
Confirmed Fitment
- BMW 340i (G20/G21) — 2016+
- BMW 440i (G22/G23/G26) — 2017+
- BMW M340i (G20/G28/G30) — 2020+
- BMW M440i (G22) — 2021+
- Toyota GR Supra A90 (B58) — 2020+
By The Numbers
Engineered To
Engineered To
Outperform
5
"
Outlet Diameter
127mm
304
SS Alloy Grade
Food-grade corrosion resistance
16
ga
Wall Thickness
1.5mm / TIG welded
0
%
Import Duty
Ships from Ontario, Canada
Diameter Comparison
200+
Units Shipped
25+
Installer Partners
100%
OEM Fitment Guarantee
CA
Ontario Engineered
Trade Program
Become a Installer
We partner with performance shops across Canada. Apply below for wholesale pricing, technical support, and priority allocation on limited stock.
- Wholesale pricing on all SKUs
- Priority allocation on limited stock
- Co-branded installation certification
- Dedicated technical support line
- Featured in our installer directory