Does the 4in2 Exhaust Manifold for CL7 fit the Acura TSX?

No. Spoon does not list it. The 4in2 Exhaust Manifold for CL7 is listed only for the Japanese-market Accord Euro R with the K20A and 6-speed manual, from 2002 to 2008. The US Acura TSX uses a different engine and chassis code, and Spoon does not name it.

Does it replace the whole factory header?

No. It replaces the four primary pipes and their merge into two, then bolts to the factory 2in1 section, which carries the gas on to the rest of the exhaust. Spoon recommends this pairing because the production 2in1 is well engineered and works with the manifold to keep a wide torque band.

Will the engine lose low-end torque?

Spoon chose the 4-2-1 layout precisely because naturally aspirated Honda engines are light on low-speed torque. Keeping that range healthy was the point, which is why the part retains the factory 2in1 instead of a short collector. Spoon publishes no dyno figures, so BA does not quote a gain.

How is the manifold built?

Spoon joins each primary to the flange with an insert method so there is no step at the exhaust port, which keeps flow smooth where the gas leaves the head. The pipes are then assembled by hand and TIG welded, the method Spoon uses on every exhaust manifold it makes.

Is a tune needed after fitting?

Spoon does not list a tune or any supporting part for the manifold, and its US distributor names none either. The Euro R can run it with the factory engine management. Owners building a fully tuned engine can still add one later, but the manifold does not depend on it.

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Description

Spoon Sports 4in2 Exhaust Manifold for CL7 Honda Accord Euro R

The Spoon Sports 4in2 Exhaust Manifold for CL7 Honda Accord Euro R gives the K20A in this Japanese-market sports sedan the first half of a 4-2-1 layout, pairing four primaries into two before the gas reaches the factory 2in1 section. Spoon’s reasoning is specific to Honda engines: naturally aspirated Hondas make relatively little torque at low speed, so a 4-2-1 design, which supports the lower and middle rev range, earns its place over a short 4-1. Testing and long experience led Spoon to recommend keeping the factory 2in1 behind its manifold rather than replacing everything, because the production part is well designed. Each pipe is fitted to the head with an insert method that leaves no step at the port, then TIG welded by hand. The Euro R carries its engine over the front wheels, and the lighter manifold takes a little weight off the nose. This part suits a Euro R driven briskly on the road; a dedicated race car may want a full system.

Features

4-into-2 primary layout to support low and mid-range torque
Insert construction leaves no step between port and pipe
Hand-assembled and TIG welded
Designed to work with the factory 2in1 section
Lighter than the factory part, easing load on the front end

Applications

Honda Accord Euro R: CL7 | 2002-2008 | 2.0L K20A

Notes

The 4in2 Exhaust Manifold for CL7 replaces the primary section only and joins the factory 2in1 section
Spoon registers the Japanese-market Accord Euro R, and the US Acura TSX is not on its fitment list
Spoon lists the manifold at 5 kg but gives no factory weight for comparison

Frequently Asked Questions

Does the 4in2 Exhaust Manifold for CL7 fit the Acura TSX? No. Spoon does not list it. The 4in2 Exhaust Manifold for CL7 is listed only for the Japanese-market Accord Euro R with the K20A and 6-speed manual, from 2002 to 2008. The US Acura TSX uses a different engine and chassis code, and Spoon does not name it.
Does it replace the whole factory header? No. It replaces the four primary pipes and their merge into two, then bolts to the factory 2in1 section, which carries the gas on to the rest of the exhaust. Spoon recommends this pairing because the production 2in1 is well engineered and works with the manifold to keep a wide torque band.
Will the engine lose low-end torque? Spoon chose the 4-2-1 layout precisely because naturally aspirated Honda engines are light on low-speed torque. Keeping that range healthy was the point, which is why the part retains the factory 2in1 instead of a short collector. Spoon publishes no dyno figures, so BA does not quote a gain.
How is the manifold built? Spoon joins each primary to the flange with an insert method so there is no step at the exhaust port, which keeps flow smooth where the gas leaves the head. The pipes are then assembled by hand and TIG welded, the method Spoon uses on every exhaust manifold it makes.
Is a tune needed after fitting? Spoon does not list a tune or any supporting part for the manifold, and its US distributor names none either. The Euro R can run it with the factory engine management. Owners building a fully tuned engine can still add one later, but the manifold does not depend on it.

About Spoon Sports

Spoon Sports was founded in 1988 in Suginami, Tokyo, by Tatsuru Ichishima, a former Honda race car tester and driver, with backing from Honda and Mugen. The company has raced Hondas from its first season, when Ichishima’s own Civic became the first Civic to enter the Japan Touring Car Championship, and its Type One workshop, opened in 2001, services and tunes the cars its parts are developed on. Spoon builds engine, drivetrain, exhaust, chassis and aero parts for Honda models and proves them on circuits and in endurance racing, including the 25 Hours of Thunderhill.

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