What exhaust manifold is best a 4-2-1 or a 4-1?

Cars & Vehicles
Air Filters and Intake Manifolds
Mazda Miata

The 4-2-1 header or tri-y header is a better design. The design improves exhaust flow. They provide better flow by combining the exhaust gases slowly and in two parts which helps with scavaging. An engine is a big air pump the faster the air goes in and out, improves performance.They can however cause clearance issues in tight engine bays. so be carful and research before you buy!

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