FMF 4.1 System Incorrect Mounting Hardware

Hi All,

FMF addressed this issue (issues related to stock mounting hardware), and provided great support for there product. It's a great exhaust system.

Edited by motomc65
Issue was addressed by FMF

Why not just buy a shorter bolt?

Because he'd rather vent.

Thanks for the feedback, I like to know who has the best fit & finish. I'm thinking about an aftermarket exaust this summer for my 09 YZ450. I'm leaning toward Dr.D. full ti. any feedback appreciated. Thanks in advanced.

Don't you have a bolt kit in your toolbox? If not, you should invest in one. It will come in very handy. They are very reasonable through Rocky Mountain MC.

I did not think I should have to go out and buy a bolt when investing this kind of money. Anyway, FMF addressed the issue for me, so all is good. Definitly not venting, but really wanted to know if anyone else had a similar issue.

The FMF full Titanium 4.1 system is well worth the money. Very good quality, and I was amazed at how much lighter it was over stock, even though the muffler is substatially larger. The only real downside to this exhaust is probably in the use of springs on the header. This must be an FMF trademark or something.

Performance is also very noticably better, and it came stock with the 94db insert. Even with the insert in place, performance is still way up over stock.

The only real downside to this exhaust is probably in the use of springs on the header. This must be an FMF trademark or something.

I hate spring mounted exhausts. I recently purchased the stainless steel megabomb for my 09 KX250F and it was a solid mount. No springs! I don't know if this is a feature of the stainless headers only or a new design for all FMF's headers. When the time comes, I will be buying a stainless megabomb for my YZ450F as well. I know they are a bit heavier but they are cheaper and MUCH more durable.

The only real downside to this exhaust is probably in the use of springs on the header. This must be an FMF trademark or something.

It's not only an FMF thing, Pro Circuit and Yoshimura also use the spring mounting method. I have had 2 FMF pipe that had solid mounts in the past, but almost all of them are spring mount. Personally I like the solid mount better, but I guess there are some advantages to spring mounting. It is nice being able to remove the header quickly without having to replace the crush gasket.

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