Help with exhaust ( aftermarket ) Yz450f

I'm thinking I'm gunna go with the pro circuit T4 with T4 header for my 06 yz450f and was wondering what everyone thought , if you use one , what there like , etc

Should I order the JD jetting kit with it ?

Thanks guys !

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You will get a bigger gain by simply installing the JDJetting kit, the exhaust system is just fin on the 06 YZf IMHO. Much more bang for your buck in other mods.

What's some other good mods?

Nothing will allow you to feel more comfertable and allow you to go faster than a suspension re-valve.

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