[SpudRider]

Originally Posted by FastDoc

I repacked the FMF Powercore (different than but similar to the TC) on the YZ before I repalced it with the Q4 and it did not help in that particular case. Worth trying though.

The Q4 made a very large difference. That's why I'm paying for one on the KLX also. :wink:

My hearing is worth it.

On the trail the louder pipes may be OK. It all depends on the engine load and RPM's, and the motor itself. Airbox design matters a lot too.

My CB175 has a quiet and smooth exhaust but a loud induction system at hig manifold pressures. Go figure.

When properly packed, the FMF TC2 meets the U.S. Forest Service sound level requirements; the FMF Powercore muffler does not. Proper muffler packing makes a big difference. Also, one should note the FMF TC2 comes with 2-stroke packing installed. This packing is not designed to withstand the heat of 4-stroke engines. Therefore, the initial packing in the FMF TC2 will deteriorate more quickly, becoming louder in the process.

The silencer packing material I recommended earlier is inexpensive, and will pack the FMF TC2 four times. This packing material is easy to use, and does a superb job with noise suppression; it is also very durable. Repacking the FMF TC2 is a very easy, and inexpensive job; I highly recommend it.

http://chinariders.net/modules.php?n...wtopic&t=10279

Spud