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Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
SPDZ1 K-Series Performance Header Downpipe for 2012–2015 Honda Civic Si & 2013–2015 Acura ILX K24
Unleash the full power of your K-Series engine with the SPDZ1 Performance Header Downpipe — the ultimate bolt-on upgrade for your 9th Gen Civic Si or Acura ILX K24. Designed for enthusiasts who demand more than just an OEM replacement, this downpipe is engineered to increase horsepower, improve throttle response, and deliver a raw, aggressive exhaust note — all while maintaining perfect fitment and durability.
Key Benefits:
Big Gains, No Compromises: Unlock real horsepower and torque increases by eliminating factory restrictions and optimizing exhaust flow.
Precision-Built Performance: Crafted from premium 304 stainless steel with mandrel-bent tubing and CNC-machined flanges for maximum durability and a perfect, leak-free seal.
OEM-Style Fitment, Race-Proven Function: Features a cast 4” bellmouth collector with 3” outlet, designed to bolt directly to your factory or aftermarket cat-back system — no modifications required.
Daily Driven, Track Ready: Whether you’re carving corners on the weekend or commuting daily, the integrated flex pipe absorbs vibration and movement, preventing stress on your exhaust system.
Sensor-Ready Out of the Box: Comes with both O2 sensor and wideband sensor bungs pre-installed for easy tuning and monitoring.
Megaphone Header Design: Enhances exhaust scavenging and improves mid-to-high RPM power for a more exhilarating driving experience.
What’s Included:
1x SPDZ1 K-Series Header Downpipe
3-Bolt Exhaust Gasket & Hardware Kit
Pre-installed O2 & Wideband Sensor Ports
Integrated Flex Section for Longevity
Vehicle Compatibility:
2012–2015 Honda Civic Si (FG4)
2013–2015 Acura ILX K24
Why Choose SPDZ1?
SPDZ1 is committed to pushing the boundaries of performance. Our products are developed in partnership with top-level tuners and tested under real-world and track conditions. Every SPDZ1 part is backed by our passion for motorsport, quality, and customer satisfaction.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
