SPDZ1 K Series Header Downpipe 12-15 Civic Si & 13-15 Acura ILX Stainless Bellmouth (Preorder)
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
SKU: SZY-019-BASE
SPDZ1 K Series Header Downpipe – 2012–2015 Honda Civic Si / 2013–2015 Acura ILX K24 (9th Gen)
Unleash the full potential of your K24 with the SPDZ1 K Series Header Downpipe, engineered for maximum flow, durability, and performance. Designed for 9th Gen Civic Si and Acura ILX models, this header downpipe eliminates factory restrictions to deliver serious horsepower and torque gains, faster turbo response, and a more aggressive exhaust note.
Crafted from 304 stainless steel with mandrel-bent tubing and CNC-machined flanges, the SPDZ1 downpipe guarantees strength, precision, and long-lasting reliability. The OEM-style 4” cast bellmouth with a 3” outlet ensures optimal exhaust velocity, while the integrated flex pipe reduces stress under high-performance driving.
Installation is a breeze with its direct bolt-on design, fitting seamlessly to the factory cat-back exhaust or aftermarket systems—no modifications required. Equipped with O2 and wideband sensor ports, plus a 90° O2 spacer and included gaskets/hardware, this kit is ready for hassle-free installation.
Key Features:
✅ Fitment:
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2012–2015 Honda Civic Si (2-door & 4-door, 9th Gen)
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2013–2015 Acura ILX K24 (9th Gen)
✅ Performance: Increased horsepower, torque, and improved throttle response
✅ Construction: 304 stainless steel, TIG welded, mandrel-bent tubing
✅ Design: 4” cast bellmouth with 3” outlet for maximum exhaust flow
✅ Compatibility: Direct bolt-on to OEM or aftermarket cat-back exhaust
✅ Precision: CNC-machined manifold flanges for a perfect seal
✅ Flex Pipe: Reduces stress and vibration for longer system life
✅ Complete Kit: Includes gasket, hardware, O2 plugs, and 90° O2 spacer
✅ Warranty: Backed by a 1-year manufacturer warranty
Built to the SPDZ1 Racing Standard, this header downpipe is the ultimate upgrade for Civic Si and ILX owners looking for affordable performance, superior fitment, and race-ready reliability.
***** This is a Pre-Order Item, we expect to ship to customers in the 3rd week of September 2025 ********
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Our History
For 23 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.