B46/B48 Stainless Steel Downpipe Upgrade [Race Downpipes]

B46 DOWNPIPE CURRENTLY ON BACKORDER. PLEASE EMAIL CUSTOMER_SERVICE@SPOOLPERFORMANCE.US IF YOU HAVE ANY QUESTIONS.   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 unmatch