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Starting on the 2003 model, Suzuki added the PAIR system to the SV650 to reduce emissions. 99-02 SV's do not have it. Specifically the PAIR system was designed to reduce the amount of raw unburnt gasoline discharged into the atmosphere.
These unburnt gasses, from motor vehicles and aircraft are one of the hydrocarbons that contribute to the greenhouse effect.

The PAIR system works by injecting a small amount of air into the exhaust system to help keep the combustion process going. It therefore burns up more of the gasoline that was not previously burned in the combustion process inside the cylinder. It does this via a small air pump that pumps the air into a fitting on top of each valve cover.

It is a common modification on 03+ bikes to disable the PAIR system after an aftermarket exhaust has been installed. The reason the PAIR is disabled is because of a popping noise that will result. This popping noise is caused by 2 forces... (1) The aftermaket exhaust does not have the baffles like a stock system so much more noise is able to simply pass through the exhaust system. (2) After modifying the exhaust (and/or the air filter or snorkle) the bike will run lean. Running lean will cause an increased popping or backfiring. Using the correct fuel mixture for your bike's configuration will greatly reduce popping or backfiring.

Disabling the PAIR system will not increase performance since all of its effects are on post-combustion gasses. Disabling it will however increase the amount of hydrocarbons that YOU allow to enter the atmosphere.
 
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