3-Series |4-series| Supra - S58 Downpipes Gen 2
LAB B58 Downpipes – Track Use Only
Unleash the true performance of your B58 engine with our LAB B58 Downpipes. Designed for maximum power gains and faster turbo spool, these downpipes eliminate the restrictive stock catalytic converters, dramatically improving exhaust flow and throttle response.
Our precision-engineered flex section minimizes stress and vibration to protect both your turbo system and chassis under high-load conditions.
Important: These downpipes are for track use only. We cannot ship to Southern California unless you are a licensed performance shop. Contact your local shop to order them from us.
Reduces turbo lag and increases spool efficiency
Optimized for maximum horsepower and torque gains
Designed to handle extreme temperatures and boost levels
Up to 25–30HP gains on a tuned B58 with stock turbo
CNC-machined flanges for OEM-like fitment
Smooth, mandrel-bent 4" piping for unrestricted flow
Integrated flex section to reduce vibration and drivetrain stress
TIG-welded stainless steel construction for durability
Drone-free aggressive exhaust note under load
Non-hybrid B58 found in G-chassis and A90/A91 Supra — 2019 to ~2024
BMW (Non-Hybrid G-Chassis):
2020–2024 BMW M340i (G20)
2021–2024 BMW M440i (G22/G23/G26)
2019–2024 BMW X3 M40i (G01)
2019–2024 BMW X4 M40i (G02)
2021–2024 BMW 540i (G30)
2021–2024 BMW 740i (G11/G12)
2020–2024 BMW Z4 M40i (G29)
Toyota:
2020–2024 Toyota GR Supra 3.0 / 3.0 Premium / A91 (MKV)
Hybridized “mild-hybrid” B58 (with 48V system) starting ~late 2024 into 2025+
BMW (Hybrid G-Chassis – LCI or G2 models):
2025+ BMW M340i (G20 LCI w/ 48V MHEV)
2025+ BMW M440i (G22/G23/G26 LCI w/ MHEV)
2025+ BMW X3 M40i (G45, new-gen chassis)
2025+ BMW X4 M40i (G46, new-gen chassis)
2025+ BMW Z4 M40i (G29, MHEV updated version)
2025+ BMW 540i (G60 hybridized)
2025+ BMW 740i (G70)
Toyota:
✅ Not Applicable. Toyota has not released a hybrid B58 Supra (yet). All Supra B58s remain Gen 2.
$132.00