So I just finished what I think was the best bang for the buck mod for my bike Reading about the new 08 YZ exhaust, light, short, not over 96db, smooth power, etc... I figured it would be a cheap exhaust upgrade for my 07 WR450F. So I scored a like new full system off the tt classifieds for $150.
Bolts right on, is almost 8" shorter and at least 3lbs lighter than stock. Noise level is def louder but not obnoxious. I'm sure it should pass the 96db sound test.
Did this exhaust ever wake this motor up I had done all the free mods including removal of ais and inner baffle. The bike was missing low end grunt, but now pulls like a tractor. Don't feel much gain on top but the bottom is awesome.
Had to richen my jetting some but otherwise it was a bolt on mod
I'll get some pics up when I get my battery on my camera recharged
I have an 06' WR 450F. Done all the free mods etc as well. I have even rejetted my carb with a 48 Pilot (stock is 45) and a 168 Main (Stock is 165). I am thinking of investing in the 2009 YZ45F GYTR
Stainless Exhaust System - 99 dBA for the same reason that you describe. My question is...what size jets did you rejet your carb to? By the way, I have a ZipTY adjustable as well, so I might be able to just back it out a bit more. I appreciate your help!
R. Craig Blume