2004 WR450, FMF factory 4 with insert - How loud?

Hello,

Im considering getting a FMF factory 4 exhaust with quiet insert for my 2004 WR450. The only other mod is a JD jetting kit and the usual derestrictions. Does anybody have a similar set and and know how loud it is?

Cheers

Lennie.

Thanks

Great info. :thumbsup:

I got the 4.1 carbon and it's not that loud at all. In fact it's alot quieter than my buddy's pro circuit pipe

Hello,

Im considering getting a FMF factory 4 exhaust with quiet insert for my 2004 WR450. The only other mod is a JD jetting kit and the usual derestrictions. Does anybody have a similar set and and know how loud it is?

Cheers

Lennie.

I have an 05 wr 450 with factory 4 and powerbomb header. The throttle response and low end is noticeably improved.

without the silent insert, its a really obnoxious 103-104 minimum.

With the 96db insert and the quiet packing that FMF sells, I come in at about 96.6 or so. I get tested when I run enduros.

Its not too bad. You'll actually hear more noise from the engine than you will from the pipe. Don't let the sound sitting still at idle scare you. Its when you are moving at about 4500 rpms when it really matters. By then, you'll have great distance between you and anyone whose listening.

On the other hand, my stock pipe with the PMB insert blows anywhere from at 93.5 to a 94.5, depending on who's testing.

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