B46/B48 Stainless Steel Downpipe Upgrade [Race Downpipes]

Spool B46/B48 Downpipe

Important Note:
Many BMW owners in the US mistakenly assume they have the B48 engine, but all U.S. market 30i models are equipped with the B46 engine. After purchasing, please send an email to customer_service@spoolperformance.us with your VIN to confirm fitment. It is very important for us to verify what engine you have as we have both models in stock. 

Why upgrade to a downpipe?
A downpipe is one of the best bang-for-your-buck upgrades for your 30i turbocharged BMW. It reduces backpressure on the turbo, helping it build boost more efficiently while improving longevity. Pair it with a proper tune, and you’ll see impressive power gains and a more aggressive exhaust sound—making it a must-have for any enthusiast looking to enhance their BMW’s performance.

• Crafted with Robotic Precision in an Argon Welding Chamber: Manufactured using advanced TIG robotic welding for unmatched consistency and strength, ensuring a flawless finish.
• Compatible with Both RHD and LHD Models: Engineered for a perfect fit with no modifications needed.
• Optimized Flow for Maximum Performance: Smooth radius bends reduce turbulence, increase airflow, and enhance turbo efficiency.
• Universal Fitment: Designed to work seamlessly with the stock cat-back exhaust as well as all aftermarket systems.
• Proven Power Gains: Expect 18-23 hp increases when paired with a proper tune, transforming your driving experience.
• SPOOL Lifetime Warranty: Built to last and backed by our industry-leading warranty.

This item fits the following F & G Series BMW models:

• 2 Series: 230i (including xDrive) (2016–2024)
• 3 Series: 320i, 330i (including xDrive) (2016–2024)
• 4 Series: 430i (including xDrive) (2016–2024)
• 5 Series: 530i (including xDrive) (2017–2024)
• X1: sDrive28i, xDrive28i (2016–2024)
• X2: sDrive28i, xDrive28i (2018–2024)
• X3: sDrive30i, xDrive30i (2018–2024)
• X4: xDrive30i (2018–2024)

LEGAL DISCLAIMER: This product is intended solely for closed-course competition or off-road use and is not legal for use on public roads or highways. This product modifies or replaces emissions-related equipment and is not compliant with EPA or CARB emissions requirements. Use of this product on vehicles operated on public roads is prohibited. By purchasing this product, the buyer acknowledges and assumes all responsibility for proper use and legal compliance.