2006 trx450r k&n filter

[Brandaman717]

If i were to install a k&n air filter on my 450r would i have to re-jet the engine or something.

[Eddiesanders250]

Do you have a pipe? A pipe and filter combination will make more airflow and a big preformance gain. Its best if you rejet.

[nicktrx400ex]

you might depends on what you have done. still stock probly not.