I have a '03 CRF450 and would like to get a new silencer for it. I am interested in the TI 4 14 inch can with the spark arrester cap and the quiet core. Has any body used this set up. If so: How much did it quiet it down? Did it take power away? Do you think it made the bike run hotter? I called FMF and the tech guy I spoke to said he didn't know to all these questions, since he didn't think they have tested it with the quiet core insert.
I know a friend that got this pipe for yz426f and it was a little quiter but still had a deep roar. he said that there was no power loss its a good deal from what i see.