Need to meet 96db limit as cheap as possible!

15 replies to this topic
  • jwleonard

Posted May 05, 2005 - 12:02 PM


I recently purchased a 98 YZ400F, I love this bike and I am having a LOT of fun on it. However, it has an older FMF Powercore 4 exhaust system on it; while I haven't had it tested I am sure it is well above 96db. I contacted FMF to see if I could use the modular end cap, but it is only for the newer model PC4. I would like to find a way to quite this thing down but I don't want to spend a fortune doing it! It is only a matter of time before I get caught and I don't want to be THE GUY with the loud annoying bike anyway. Could you please give me some ideas on how to accomplish this? Thanks

  • 426Hurricane

Posted May 05, 2005 - 12:23 PM


find a used FMF Q for $90 like i did for my 00 426.

  • Dano426

Posted May 05, 2005 - 12:44 PM


If you have to be at 96 db or lower, you have three options.
1. FMF Q
2. White Bros E2
3. WR stock exhaust (this is plugged and you will lose a fair amout of power)

  • jwleonard

Posted May 05, 2005 - 01:40 PM


426Hurricane - where did you find a Q that cheap?

Dano426 - Losing power is not an option! Out of the FMF and White Brothers which one in your opinion will offer the most for my money.

Thanks for the quick replies!

  • yzf450jack

Posted May 05, 2005 - 05:04 PM


Here look in the TT store http://shop.thumpert...Exhaust&Page=24 :)

  • kizzle426

Posted May 06, 2005 - 02:29 AM


I also have the older Powercore IV muffler and also Hi-flo header. I'm at 104db so I would expect you're around there. I talked to some lady at FMF and she said there was nothing i could do to the muffler as is. You're best bet is to find a used Q muffler, and keep it well packed. Or find some way to put some baffling in the muffler. i've made attempts to no avail, so, good luck. By the way, this is an '02 426 so it might be a little louder.

  • Dano426

Posted May 06, 2005 - 06:30 AM


Dano426 - Losing power is not an option! Out of the FMF and White Brothers which one in your opinion will offer the most for my money.

From what I see from the Q is that you will lose some of the high rev power - no over rev. Low to mid is still great and the powerbomb makes it even better. I ride mostly trails and a track now and then so I don't rev out the bike like a die hard MXer. When I purchased the Q I cringed at the price, but now it is worth every penny. :)

I have heard good thinks about the E2 but have had no personal experience with them.

Check out he TT store, they have good prices and may have the deal your looking for?

Tell us what you get and what you think of it

  • John_Lorenz

Posted May 06, 2005 - 06:39 AM


I have the E2 went from an R4, I see no differance in power or delivery in the E2 as compared to the R4 full Race. I like the E2 it is a nice looking pipe well built and you can remove the core for Private Track racing. But honestly I see no differance there acept it jumps to 107db without the core.

Get the E2 support the community :)

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • jwleonard

Posted May 06, 2005 - 11:06 AM


Well thanks for all the advice, unfortunately I didn't find a super cheap solution but I did find a deal on a Q so that is what I am buying. Thanks again.

  • rail45

Posted May 07, 2005 - 05:01 PM


I have a 03 yz450 with the stock pipe and a pro moto billet endcap. If I put in their quiet insert I can pass at 94db, w/o the insert I'm sure I'm still over 100db.
See if you can find a stock 03 pipe on ebay or someting and get the promoto endcap setup.

  • ovrrdrive

Posted May 07, 2005 - 06:06 PM


I also have the PMB endcap with the insert, and I have a really hard time believing it is under about 102 db even with the quiet insert and the SA installed. It is better than stock, but it is still loud.

I have seen several people say they failed the 96db sound check with it too...

PMB advertises the 250f quiet insert as a 96db insert and says you can pass the test with it, but the 450 insert is advertised as "reduces output by 4-5db. It never says you can meet or beat the 96db test for the YZ450.


  • jwleonard

Posted May 07, 2005 - 06:46 PM


I have already purchased the FMF Q, I rode today and was very pleased with the performance. It has more bottom end and didn't seem to hurt the mid range/high end at all. This isn't as cheap a solution as I was hoping for, but it seems to be the one that works! It was really nice not to be hiding from the rangers today and not feeling like a jerk out there. Thanks to everyone for taking the time to help me out.

  • Dano426

Posted May 09, 2005 - 10:05 AM


I have already purchased the FMF Q, I rode today and was very pleased with the performance.

You'll be very happy with your puchase. The rangers don't even bother checking you if you have a Q :)

  • simimi

Posted May 09, 2005 - 01:15 PM


another note, I went from the Iv to the Q and did not have to change jetting either. very happy, slight loss of power, but it still has more than I use. I also have the PowerBomb header and passed the CA noise check.

Mik e

  • ArmyGuy

Posted May 09, 2005 - 05:23 PM


I have a 99 YZ400 with the Pro Circuit T-4 pipe, and i cringe everytime i fire it up in my small, quiet community, anyone have the same setup but added the "quiet core" add on? I love the pipe and dont really wanna swap it out.

99 YZ400 Street lagal

  • cowboyona426

Posted May 09, 2005 - 07:52 PM


If you want to be really cheap and look like a spode, you can do what some guys do in a pinch- cut about a 6" chunk out of an old inner tube and zip-ty it to your pipe... it looks plain dumb but it works for a temporary fix.
If I were you, I would give Bob at Thunder Alley ( a call- he mades 96 dB inserts for his pipes now I believe.

Related Content


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.