Stage 1
A stage 1 Harley has a high-flow air cleaner, a freer-flowing exhaust and a fuel tune to match. It is the most common first upgrade.
What is a stage 2 Harley?
Stage 2 adds performance cams to the stage 1 parts, often with upgraded pushrods and valve springs. It changes where the engine makes its power.
Do I need a tune after a Harley exhaust?
On fuel-injected bikes, yes. More airflow without more fuel makes the engine run lean, which adds heat. A tune keeps the mixture right and is part of every stage kit.
Harley air cleaner upgrade benefits
Better breathing, a clearer intake sound and a filter you can clean and reuse.
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