How to set up exhaust system
If you change exhaust system or air clear, you will get lean mixture. So carburetor or ECU (full-computer or Sub-computer) set up are mandatory to bring out the potential spec. Without set up, you can start engine and ride motorcycle, but you feel less power in low-middle range rpm. Worst case, you can damage your engine with lean mixture.
My recommendation for comfortable, cool, easy maintenance ride:
For Air cleaner, keep stock Air cleaner box with a minimum filter and extract any obstruct in air route
For Carburetors, Install CR/FCR/TMR with Multiple Jet Nozzle tuned by YOSHIMURA.
For Fuel Injection, Install Power Commander and AUTOTUNE (re-write ECU for de-tuned super sports).
For Air cleaner:
For Fuel Injection
Full computer set up video
If you set up by yourself, always choose richer set up to cool down combustion area for long engine life.
Lean or rich:
If you are not familiar with set up, please ask your local professional shop first. Worst case, you can damage your engine with lean mixture.