Does the 4-2-1 Exhaust Manifold for EK9 cars add top-end power or low-end torque?

Both, with the emphasis on torque. The manufacturer designed the 4-2-1 Exhaust Manifold for EK9 cars to deliver power from low and mid engine speeds up to high rpm, and says torque response improves. No dyno figures are published, so the gain on your car will depend on the rest of the setup.

What do the three pipe sizes mean?

The header steps up in diameter as the pipes merge: 42.7mm, then 50.8mm, then 60.5mm. In a 4-2-1 design, the four primaries pair into two pipes before joining into one, and the listed sizes follow that progression from the cylinder head toward the outlet.

What material is it made from?

The header is stainless steel. The North American listing gives the material simply as SUS, the Japanese designation for stainless, and does not name the grade or the wall thickness. If the exact grade matters to you, ask us and we will request it from the US distributor.

Will the header fit a US EK Civic engine?

No, it is not listed for that car. The manifold is designed for the B16B in the Japanese-market EK9 Civic Type R, which is the only application given. Send us your engine code before ordering if your car is not a Japanese-market EK9, and we will check whether the flange and routing match.

What hardware comes with the header?

Nothing is specified. Neither the North American listing nor the price list describes gaskets, studs, nuts or sensor bungs, so plan to confirm the contents before installation. Contact us and we will check exactly what ships in the box with the US distributor.

Description

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Description

J’s Racing 4-2-1 Exhaust Manifold for EK9 Honda Civic Type R

J’s Racing’s 4-2-1 Exhaust Manifold for EK9 Civic Type R owners is a stainless steel header laid out in the 4-2-1 pattern, with the four primaries pairing into two before merging into one. J’s Racing designed it with the emphasis on torque, so the B16B pulls harder from low and mid revs as well as at the top end, and the company says torque response improves. The pipe sizes step up from 42.7mm through 50.8mm to 60.5mm. It is a logical next step for an EK9 that already wears a free-flowing J’s Racing exhaust and an owner who values midrange drive as much as peak power.

Features

Stainless steel construction
4-2-1 layout, four primaries joining in pairs before the final merge
Stepped pipe sizes of 42.7mm, 50.8mm and 60.5mm
Torque-focused design that delivers power from low and mid revs up to high rpm
Improved torque response, according to J’s Racing

Applications

Honda Civic Type R: EK9 | 1997-2000 | 1.6L B16B

Notes

Intended by J’s Racing for the JDM EK9 Civic Type R with the B16B engine; fitment on the US-market EK Civic cannot be assumed
J’s Racing does not publish power figures, weights or a parts list for this header
Gaskets, studs and sensor provisions are not described in the source, so confirm them before installation day
Other EK9 exhausts from J’s Racing include the R304 60RS Exhaust for the EK9 Civic Type R
Bulletproof Automotive sources this header from Japan through J’s Racing USA and confirms its lead time when the order is placed

Frequently Asked Questions

Does the 4-2-1 Exhaust Manifold for EK9 cars add top-end power or low-end torque? Both, with the emphasis on torque. The manufacturer designed the 4-2-1 Exhaust Manifold for EK9 cars to deliver power from low and mid engine speeds up to high rpm, and says torque response improves. No dyno figures are published, so the gain on your car will depend on the rest of the setup.
What do the three pipe sizes mean? The header steps up in diameter as the pipes merge: 42.7mm, then 50.8mm, then 60.5mm. In a 4-2-1 design, the four primaries pair into two pipes before joining into one, and the listed sizes follow that progression from the cylinder head toward the outlet.
What material is it made from? The header is stainless steel. The North American listing gives the material simply as SUS, the Japanese designation for stainless, and does not name the grade or the wall thickness. If the exact grade matters to you, ask us and we will request it from the US distributor.
Will the header fit a US EK Civic engine? No, it is not listed for that car. The manifold is designed for the B16B in the Japanese-market EK9 Civic Type R, which is the only application given. Send us your engine code before ordering if your car is not a Japanese-market EK9, and we will check whether the flange and routing match.
What hardware comes with the header? Nothing is specified. Neither the North American listing nor the price list describes gaskets, studs, nuts or sensor bungs, so plan to confirm the contents before installation. Contact us and we will check exactly what ships in the box with the US distributor.

About J’s Racing

J’s Racing was established in Osaka in 1989, as VTEC engines and lightweight Civics and Integras were changing what a Honda could do, and it has built parts for Hondas ever since. The company develops engine response, suspension, braking, cooling and aerodynamics together as one system, then proves the parts in time attack, gymkhana, endurance and circuit racing. Its Fit lapped Tsukuba Circuit in 1’00.459, and its naturally aspirated AP1 S2000, the Maou car, became the company’s reference build for the Honda roadster. Every J’s Racing part is designed and tested in Japan, and J’s Racing USA in Carson, California handles distribution in the United States.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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J’s Racing 4-2-1 Exhaust Manifold for EK9 Honda Civic Type R [XA-H5]

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J’s Racing 4-2-1 Exhaust Manifold for EK9 Honda Civic Type R

Features

Applications

Notes

Frequently Asked Questions

About J’s Racing

Reviews