G8X M2 | M3 | M4 - S58 Guaranteed NO CEL Catted Highflow Downpipes
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LAB StealthFlow™ NO-CEL 200-Cell High-Flow Catted Downpipes — G87 M2 / G80 M3 / G82 M4
🔥 Guaranteed No Check Engine Light — No O₂ Spacers Needed
📦 In Stock & Ships From California in 1–2 Business Days
Unlock the full character of your S58 engine with the perfect balance of performance, sound, reliability, and drivability. The LAB StealthFlow™ 200-Cell Downpipes are engineered for enthusiasts who want more power and a deeper exhaust tone—without triggering a check engine light or requiring coding, tuning, or spacers.
Designed specifically for the G87 M2, G80 M3, and G82/G83 M4, these downpipes deliver an OEM-plus experience with noticeable gains in throttle response, turbo spool, and refinement.
🚀 Why StealthFlow™ Is Different
✔ Guaranteed NO CEL — Precision sensor placement and flow engineering eliminate the need for tuning or spacers.
✔ 200-Cell High-Flow Catalyst — Maximizes exhaust flow while maintaining emissions control hardware.
✔ Integrated Thermal Heat Shield — Reduces radiant heat, protects engine components, and supports repeatable performance.
✔ OEM-Perfect Fitment — Bolts directly to factory or aftermarket exhaust systems.
✔ Enhanced Sound Profile — Deeper, throatier tone with zero rasp and refined cold starts.
🧩 Key Features
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304 stainless steel construction
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CNC-machined flanges
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TIG-welded and pressure-tested
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Factory mounting points retained
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Fully plug-and-play installation
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Works with stock or aftermarket exhaust systems
📈 What You’ll Feel & Hear
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Faster turbo spool
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More responsive power delivery
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A richer, more aggressive exhaust note
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Coupe-worthy performance without compromises
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OEM drivability — zero warning lights
📌 Fitment
| Model | Engine | Years |
|---|---|---|
| G87 M2 | S58 | 2023+ |
| G80 M3 | S58 | 2021+ |
| G82/G83 M4 | S58 | 2021+ |
⚠️ Installation Notes
Professional installation is recommended.
🛑 Emissions & CARB Disclaimer
This product is NOT CARB-compliant and is intended for off-road, race, or competition use only.
Not legal for sale, installation, or use on vehicles registered for on-road use in the state of California or other regions that adopt CARB emissions standards.
By purchasing and/or installing this product, the customer acknowledges and assumes all responsibility for compliance with applicable emissions regulations.
🏁 The Upgrade BMW Should’ve Built
More flow. More sound. No warning lights.
If you want the cleanest driving experience with zero compromises — StealthFlow™ is the new standard.
G8X M2 | M3 | M4 - S58 Guaranteed NO CEL Catted Highflow Downpipes
We’ve got you.
Whether it’s fitment questions, order updates, or install guidance, our team’s here to make sure you get the right parts, the first time. Fast replies, real support, no runaround.
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Shipping Information
We ship fast and nationwide. Most in-stock items leave our SoCal warehouse within 1–3 business days. You'll get tracking as soon as it’s on the way. Need it quicker? Expedited options are available at checkout.
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Customer Support
Questions about your order? Our support team is here to help every step of the way. Reach us by email or DM.
Fast responses, real solutions, no bots.
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Contact Us
Whether it’s about your order, install guidance, or wholesale inquiries, don’t hesitate to reach out.
📞 Phone: +1 (949) 371-5212
📧 Email: orders@legendaryautobuilders.com
📍 Visit Us: 21087 Commerce Pointe Drive, Walnut, CA 91789We’ll always do our best to get back to you quickly and take care of you the right way.
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FAQs
Do you offer financing or payment plans?
Yes. At checkout, you can use Shop Pay Installments or Affirm to split your purchase into easy monthly payments. Financing options, including potential 0% interest plans, are shown during checkout and are subject to approval.
Will this part fit my BMW?
Yes. Every product we sell is verified for specific BMW models and chassis. If you want extra peace of mind, you can send us your model, year, or VIN and our team will personally confirm fitment before you order. BMW fitment accuracy is a priority at Legendary Auto Builders.
Are your parts OEM-quality or aftermarket replicas?
We only carry high-quality aftermarket parts that meet or exceed OEM standards. Each product page clearly outlines materials, construction, and finish so you know exactly what you’re getting. We do not sell low-grade replicas or poorly made components.
Where do you ship from and how long does shipping take?
Most in-stock orders ship from our California warehouse within 1–2 business days. Standard U.S. delivery typically takes 3–7 business days depending on location. Made-to-order or specialty items may require additional production time, which is always noted on the product page.
Can I install this myself, or do I need a professional?
Many of our products are designed for direct bolt-on installation and can be installed at home with basic tools. For more complex parts—such as aero components or performance upgrades—we recommend professional installation for best results. If you have questions about install difficulty, just reach out.
What happens if the part doesn’t fit my vehicle?
If there’s a fitment issue due to an error on our end, we’ll make it right. Our team will help resolve the issue quickly, whether that means an exchange or another solution. Fitment accuracy matters to us, and we stand behind the products we sell.
Are your products tested for quality and durability?
Yes. All products go through quality checks and are sourced from trusted manufacturers. We work closely with suppliers and installers to ensure every part meets our performance and durability standards before it ever reaches your car.
Do your products come with a warranty?
Most items include a warranty covering manufacturing defects. Warranty length and coverage details vary by product and are listed on the product page. If you ever have a concern, our support team is here to help.