Quiet Exhaust Recommendation

7 replies to this topic
  • Pooley

Posted November 04, 2001 - 04:11 PM


What exhaust would you recommend that would have the spark arrestor and come in under 94dB? I'm thinking the Vortip but I am open to other suggestions. I know that the stock plug really robs power so I want to replace it. Don't really want to replace the whole thing since I don't have the $$$ for a new system.

Also, where can I find the Vortip? Is it the same as the WR replacement baffle from BajaDesigns?


  • Rocky

Posted November 04, 2001 - 04:57 PM


You can find Vortip at http://www.chaparral-racing.com/ for around $60. It is much better than the stock baffle but it is not as good as running without any baffles in the muffler. On couple of my XR 600 and 650s I used the Thumper racing's baffle (around $80). I think the Thumper racing baffle is much better than Vortip. BTW, Baja design's brand is the Vortip and they are asking more $ than if you buy it from Chaparral.

[ November 04, 2001: Message edited by: Rocky ]

  • Brian_in_Long_Beach

Posted November 04, 2001 - 06:56 PM


I have a Thumper Racing Quiet Core in my '99 WR400. It was measured at 95dB by the Forest Service.


  • z4me

Posted November 05, 2001 - 03:00 AM


The FMF 4Q really quiets it down, and saves weight. Performance is great - I am really happy with it - at least on my 250F.

- Sean

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

Posted November 05, 2001 - 05:58 AM


Pooley, My dads WR426 with a stock US pipe and Vortip blew an impressive 89dbs. This was done by a Ranger in Kennedy Meadows per our request. The bike is really quiet and im my opinion its not very resctricted. These inserts are a great idea because they can be installed and taken out in seconds, in fact you could take it out half way through a ride and throw it in your backpack if get to an area that is far from civilization. Pretty cool. I currently use a PC T4, I purchased the "Quiet Core" and with that insert in I think I can push my bike faster than I can ride it,bad idea.... It has like this 3/8" hole that very little exhaust gets out, but it's quiet :)

  • Brian_in_Long_Beach

Posted November 05, 2001 - 11:56 AM


What RPM was your dad's bike measured at? 89dB is awfully quiet for a bike at half the redline.


  • AMinkman

Posted November 05, 2001 - 02:33 PM


NVR FNSH, do you have any info on your pipe? What is the USFS requireing to pass. I understand they have a book and if your manufacturer isn't listed it won't pass. Has anyone heard this before?

  • Dan_Lorenze

Posted November 05, 2001 - 06:34 PM


Brian, Im not sure what the RPM's were cause they have this little coil device that they put on the rear fender that they look at but I can tell you that it was something like just above idle. I do remember the ranger tell us that it was one of the quietest bike they've tested and im possitive that it was 89db's. Also, with my PC quietcore in I blew a 94db and the stock/Vortip setup ran WAY better, I really think that proper jetting when using all types of "quiet inserts" is vital. see ya dan


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